Skip to main content

Factors affecting the dental erosion severity of patients with eating disorders

Abstract

Background

Intraoral disease is a common occurrence in patients with eating disorders, particularly dental erosion, which frequently becomes severe and may hinder daily life. The severity varies from patient to patient. Understanding the underlying mechanisms may help prevent dental erosion in these patients. Accordingly, we investigated the relationship between the severity of erosion and the behavior of patients with eating disorders, with a focus on daily diet and vomiting behavior.

Methods

A total 71 female eating disorder outpatients from the Clinical Center of Psychosomatic Dentistry of Nippon Dental University Hospital and the Psychosomatic Internal Medicine Department of Kudanzaka Hospital or who were hospitalized at Hasegawa Hospital were enrolled. Dental erosion severity and location were determined by oral examination. Patients who induced vomiting were queried on their behavior during vomiting and on routine diet habits. Patients with dental erosion were further divided into mild and severe groups based on the lesion severity and the groups compared.

Results

Dental erosion was observed in 43 of 50 subjects who induced vomiting. Dental erosion was most frequent on the palatal side of the anterior maxillary teeth, occurring in 81.3% of the subjects. There were significant differences observed between the mild and severe groups according to post-vomiting oral hygiene. Significantly more subjects in the mild group consumed large amounts of water before vomiting, and significantly more subjects in the severe group routinely consumed carbonated beverages or sweetened food.

Conclusions

While self-induced vomiting is the main cause of dental erosion in eating disorder patients, the erosion severity may be affected by behavior when inducing vomiting or by routine consumption of certain foods and beverages. Addressing these factors may help prevent severe dental erosion in patients who chronically induce vomiting.

Background

Patients with eating disorders are more likely to demonstrate high levels of dental fear compared to other dental patients [1]. Because of the presence of dental fear, potential nutritional deficiencies, and exposure to stomach acids from frequent vomiting, eating disorder patients may have numerous dental caries and intraoral diseases such as salivary gland swelling and dental erosion [2, 3]. Dental erosion in particular is often observed in patients with eating disorders, with some patients requiring complex restorative treatment for this condition [4–7].

Generally, dental erosion is a disease that affects people who are directly or indirectly exposed to hydrochloric, sulfuric, and other acids through their occupations [8]. Recently, multiple studies have reported dental erosion due to overconsumption of carbonated beverages or citrus fruit [9, 10]. However, because these types of dental erosion usually progress gradually, patients usually do not experience symptoms such as pain induced by cold fluids, and even when symptoms do occur, the pain is minimal [9].

In contrast, dental erosion may progress quickly in eating disorder patients and interrupt daily life due to cold-induced pain or marked aesthetic damage [5, 11]. However, the severity of dental erosion varies among eating disorder patients and is not associated with the eating disorder’s duration [3, 5]. Instead, other factors are presumed be involved in the progression of dental erosion; determining these factors may help prevent severe damage.

Accordingly, we investigated the relation between the severity of dental erosion and the vomiting behavior and regular dietary habits of patients with eating disorders.

Methods

Subjects

A total of 71 female eating disorder patients (aged 17–47 years, mean 31.1 years), including outpatients at the Clinical Center of Psychosomatic Dentistry of Nippon Dental University Hospital, the Psychosomatic Internal Medicine Department of Kudanzaka Hospital, and inpatients at Hasegawa Hospital, were enrolled. A physician who specializes in psychosomatic medicine or a psychiatrist examined the subjects to exclude physical illnesses and other mental disorders. An eating disorder was diagnosed according to the criteria of the Diagnostic and Statistical Manual of Mental Disorders, 4th edition, text revision (DSM-IV-TR) [12]. The duration of the eating disorder ranged from 1 to 26 years (mean 11.7 years). Anorexia Nervosa (AN) was diagnosed in 35 patients (Restricting type = 11, Binge-Eating/Purging type = 24), Bulimia Nervosa (BN) in 27 (Purging type = 21, Nonpurging type = 6), Eating Disorder Not Otherwise Specified in 3, and unclear diagnosis in six patients. Patients with AN or BN who binge ate and purged through the use of laxatives only were not included in the study. Based on self-induced vomiting behavior, patients were further classified into vomiting (n = 50) and non-vomiting (n = 21) groups.

All patients received an oral and written study explanation, and provided written consent to participate. This study was approved by the ethics review committees of the School of Life Dentistry of Nippon Dental University, Nippon Dental University Hospital, Kudanzaka Hospital, and Hasegawa Hospital.

Measurements

The occurrence and severity of dental erosion was assessed by two dentists experienced in providing dental care to patients with eating disorders, using diagnostic criteria for dental erosion [8] and scored as E1 (slight) to E4 (severe) (Figure 1).

Figure 1
figure 1

Diagnostic criteria for dental erosion. Dental erosion limited to the enamel (mild group). Dental erosion extending to the dentin (severe group). E1 (slight): Enamel alone affected. E2 (mild): Additional progression and tooth loss, but not involving the dentin. E3 (moderate): Tooth loss affecting the dentin. E4 (severe): Complete tooth loss.

The 50 vomiting group subjects were assigned to one of two subgroups based on dental erosion severity. Subjects without dental erosion and those with erosion only involving the enamel (E1, E2) were placed into the mild group (n = 24). Subjects with erosion reaching the dentin with or without tooth loss (E3, E4) were placed in the severe group (n = 26).

Subjects were queried on their habits before and after vomiting through a standardized interview with the dentists (MO and YI). The interview included questions concerning water consumption to induce vomiting; post-vomiting oral hygiene; and regular dietary habits, such as consumption of acidic foods and beverages, citrus fruit, and sugar-sweetened foods such as candy or gum.

Statistical analysis

Dental erosion frequency was compared between the vomiting and non-vomiting groups using the χ2 test. The mild and severe vomiting subgroups were compared using a t-test according to age and eating disorder duration, and a χ2 test for vomiting behavior and dietary habits.

Results

Self-induced vomiting and dental erosion frequency

Dental erosion was observed in 43 of 50 subjects (86%) in the vomiting group, and 0 of 21 subjects in the non-vomiting group, a difference that was statistically significant (P <0.01, Figure 2).

Figure 2
figure 2

Dental erosion frequency compared according to the presence of self-induced vomiting.

Dental erosion severity and incidence by location

In the vomiting group, dental erosion occurred most frequently on the palatal side of the anterior maxillary teeth (81.3% of cases). Additionally, over half of the subjects exhibited erosion on the mandibular molar occlusal surface and the maxillary molar occlusal surface and palatal surface.Mandibular molar occlusal surface erosion was scored as E3 or E4 grade severity in 34.7% of all subjects (Figure 3). Representative oral lesions are illustrated in Figure 3. Dental erosion was more frequent and severe in the maxillary teeth on the palatal side and in the mandibular molar occlusal surfaces.

Figure 3
figure 3

Dental erosion severity and incidence by location: vomiting group. P: palatal side; I: incisal side; LA: labial side; O: occlusal surface; B: buccal side; L: lingual side.

Dental erosion severity, patient age, and disease duration

The mean age and eating disorder duration for the mild and severe groups are shown in Table 1. There was no statistically significant difference between the groups.

Table 1 Patient age and eating disorder duration

Dental erosion severity and behavior before and after vomiting

Nineteen subjects (79.2%) in the mild group and nine subjects (34.6%) in the severe group consumed at least one liter of water to induce vomiting (χ2 test, P <0.01, Figure 4). Tooth brushing was performed by nine subjects (37.5%) in the mild group after vomiting, oral rinsing by 13 subjects (54.2%), and no action by two subjects (8.3%). In the severe group, tooth brushing was performed by 18 subjects (69.2%), oral rinsing by five subjects (19.2%), and no action by three subjects (11.5%). These differences were statistically significant (P <0.05, Figure 5).

Figure 4
figure 4

Water consumption before vomiting compared according to the dental erosion severity.

Figure 5
figure 5

Post-vomiting oral hygiene activities compared according to the dental erosion severity.

Dental erosion severity and routine dietary habits

Five subjects (20.8%) in the mild group and 14 subjects (53.8%) in the severe group regularly consumed acidic foods, such as carbonated beverages and citrus fruit (Figure 6). Three subjects (12.5%) in the mild group and ten subjects (38.5%) in the severe group regularly consumed sugar-sweetened foods such as candy and gum. Significant differences in both characteristics were observed between the groups (P <0.05, Figure 7).

Figure 6
figure 6

Routine consumption of acidic foods compared according to the dental erosion severity.

Figure 7
figure 7

Routine consumption of sweetened foods compared according to the dental erosion severity.

Discussion

Several epidemiological studies have investigated the prevalence of dental erosion. In the adult population, prevalence data ranged between 4% and 100% [13]. However, the methods and indices applied vary considerably, and this may limit the comparability of the prevalence data [14]. A recent study reported that dental erosion was observed in 8.8% of a healthy control group, and 45.0% of an eating disorder group [4]. In the present study, dental erosion was not observed in the non-vomiting group, while erosion was found in more than 80% of the vomiting group. This suggests that self-induced vomiting can cause dental erosion in patients with eating disorders. However, most notably, dental erosion was not observed in seven subjects in the vomiting group. This finding shows that vomiting is not always accompanied by dental erosion. Determining the protective mechanism underlying this finding could help preserve the teeth of patients with eating disorders, even if habitual self-induced vomiting cannot be stopped.

This study showed that dental erosion occurs most frequently on the palatal margin of the maxillary teeth as well as on the mandibular molar occlusal surfaces, where it is particularly severe. This is consistent with past studies characterizing endogenous dental erosion [15]. As vomitus passes through the oral cavity, dental erosion targets surfaces unprotected by the tongue, buccal mucosa, or lips—surfaces experiencing direct vomitus contact. In addition, the eroded dentin on occlusal surfaces may be further subject to damage during mastication. These characteristic lesions may help dentists recognize endogenous dental erosion and to consider the possibility of an eating disorder. Frequently, the dentist is the first health care provider to find the clinical symptoms of an eating disorder [16]. This may provide an opportunity to identify eating disorder patients who are not receiving medical attention. Thus, it is important for dentists to accurately recognize the pattern of dental erosion associated with eating disorders.

Dental erosion was less common in areas protected from direct acid exposure by the tongue and other structures. Using a device, such as a mouth guard, during vomiting could similarly suppress dental erosion [11]. However, this intervention could also be interpreted as condoning the act of vomiting and warrants full debate.

Dental erosion severity did not correlate with the eating disorder duration or patient age. However, it is generally thought that acid exposure for longer periods and with more frequency increases the severity of tooth erosion. The subjects were not followed long-term but only underwent a one-time cross-sectional survey; therefore, the relationship between erosion severity and vomiting frequency and disease duration requires further study.

A large proportion of subjects in the mild group consumed water before inducing vomiting. Drinking water immediately before vomiting is thought to dilute the gastric contents and neutralize the vomitus acidity, thereby reducing dental erosion severity. In addition, diluted vomitus flows more easily, which may decrease residual vomitus in the mouth. The impact of significant pre-vomiting water consumption on the stomach, esophagus, and other organs warrants investigation from an internal medicine perspective. Our results suggest that this behavior can effectively protect the teeth from acid.

This study also showed that tooth brushing immediately after vomiting is harmful, a finding consistent with past studies showing that brushing after vomiting or eating acidic foods etches the acid onto tooth surfaces [17]. In addition, brushing immediately after vomiting can remove the superficial tooth surface down to the decalcified layer, which can remineralize. A recent study has shown that approximately 83% of subjects who brushed their teeth following vomiting episodes suffered from dental erosion compared with subjects who only rinsed their mouth or did nothing [18]. Therefore, to avoid worsening dental erosion, post-vomiting oral hygiene should comprise thorough oral rinsing with water or other liquids to neutralize acid in the oral cavity [19], waiting to allow remineralization, and careful tooth brushing.

Excessive consumption of acidic foods is believed to promote dental erosion [20, 21]. The critical pH of surface enamel is approximately 5.5, and approximately 6.7 in the exposed dentin. Generally, carbonated beverages and citrus fruit have a pH of approximately 3.0, more than capable of dissolving the tooth. Therefore, regular consumption of these products may cause chronic oral acidity, which may exacerbate dental erosion caused by vomiting. In addition, oral bacteria including Streptococcus mutans metabolize consumed sugars and produce lactic acid and other acids, generating oral acidity and promoting dental erosion. However, even in oral acidity caused by consuming acidic or sweetened foods, the teeth will remineralize after a certain period. Thus, if the oral cavity pH can be neutralized before tooth remineralization begins, dental erosion can be minimized, even if these food products are consumed.

For eating disorder patients, sugar consumption is often an important source of calories, and prohibiting these patients from consuming sweetened foods risks morbidity or fatality [22]. As such, the progression of dental erosion should be slowed by changing how patients consume sweetened foods or by modifying behaviors after consumption, such as avoiding continuous consumption or rinsing the mouth afterwards.

Conclusions

Self-induced vomiting is the main cause of dental erosion in patients with eating disorders. Erosion occurs most frequently on the palatal side of the maxillary teeth and the mandibular molar occlusal surfaces, which come into direct contact with vomitus and gastric acid. Many patients exhibit severe erosion of the molars. Disease duration and patient age did not correlate with erosion severity.

This study also revealed that water consumption prior to vomiting and oral rinsing afterwards may help prevent erosion from progressing from mild to severe. Conversely, tooth brushing after vomiting had a detrimental effect. Not surprisingly, regular consumption of acidic or sweetened foods was associated with progression to severe erosion. Addressing these factors could help prevent the progression of dental erosion in patients who chronically induce vomiting.

References

  1. Sirin Y, Yucel B, Firat D, Husseinova-Sen S: Assessment of dental fear and anxiety levels in eating disorder patients undergoing minor oral surgery. J Oral Maxillofac Surg. 2011, 69: 2078-2085. 10.1016/j.joms.2010.12.050.

    Article  PubMed  Google Scholar 

  2. Aranha AC, Eduardo Cde P, Cordás TA: Eating disorders. Part I: psychiatric diagnosis and dental implications. J Contemp Dent Pract. 2008, 9: 73-81.

    PubMed  Google Scholar 

  3. Willumsen T, Graugaard PK: Dental fear, regularity of dental attendance and subjective evaluation of dental erosion in women with eating disorders. Eur J Oral Sci. 2005, 113: 297-302. 10.1111/j.1600-0722.2005.00227.x.

    Article  PubMed  Google Scholar 

  4. Hermont AP, Pordeus IA, Paiva SM, Abreu MH, Auad SM: Eating disorder risk behavior and dental implications among adolescents. Int J Eat Disord. 2013, 46: 677-683. 10.1002/eat.22132.

    Article  PubMed  Google Scholar 

  5. Otsu M, Suzuki A, Hasegawa I, Miyauchi M, Karibe H, Okada T, Ishii T, Yamaoka M, Ichijyo T, Sato T: Dental problems in patients with eating disorder accompanied by self-induced vomiting –Oral environment. Jpn J Psychosom Med. 2006, 46: 960-968.

    Google Scholar 

  6. Inoue H, Matsuzaka T, Suzuki K, Ootsuru H, Takagi S, Nagatani T, Nagatani N, Nishimura Y: Study of caries prevalence in those with eating disorders. Jpn J IRYOU. 2003, 57: 100-107.

    Google Scholar 

  7. Otsu M, Hamura A, Ishikawa Y, Yamaoka M, Ichijyo T, Ishii T, Okada T, Karibe H, Sato T: Dental problems of patients with eating disorder accompanied by self-induced vomiting: DMFT, reasons for consultation. Jpn J Psychosom Med. 2011, 51: 329-335.

    Google Scholar 

  8. Japanese Society for Oral Health industrial hygiene section: Dental Erosion and Industrial Health Management. 1985, Tokyo: Oral Health Association of Japan, 13-28.

    Google Scholar 

  9. Cronin RJ, Cagna DR: Causes of severe tooth wear. Jpn Dental Outlook. 2003, 101: 254-265.

    Google Scholar 

  10. O’Sullivan E, Milosevic A: UK National Clinical Guidelines in Paediatric Dentistry: diagnosis, prevention and management of dental erosion. Int J Paediatr Dent. 2008, 18: 29-38.

    Article  PubMed  Google Scholar 

  11. Otsu M, Hamura A, Miyauchi M, Okada T, Karibe H, Ishii T, Yamaoka M, Ichijyo T, Sato T: Efficiency of a mouth guard to prevent a toothache (cold-water pain) in a patient with eating disorder accompanied by self-induced vomiting. Jpn J Psychosom Med. 2010, 50: 139-145.

    Google Scholar 

  12. American Psychiatric Association: Eating Disorders. In Diagnostic and Statistical Manual of Mental Disorders, Text Revision (DSM-IV-TR). 4th edition. Washington, DC: American Psychiatric Association; 2000:583–595.

    Google Scholar 

  13. Jaeggi T, Lussi A: Prevalence, incidence and distribution of erosion. Monogr Oral Sci. 2014, 25: 55-73.

    Article  PubMed  Google Scholar 

  14. Schlueter N, Jaeggi T, Lussi A: Is dental erosion really a problem?. Adv Dent Res. 2012, 24: 68-71. 10.1177/0022034512449836.

    Article  CAS  PubMed  Google Scholar 

  15. Smith BGN, Knight JK: A comparison of patterns of tooth wear with aetiological factors. Br Dent J. 1984, 157: 16-19. 10.1038/sj.bdj.4805401.

    Article  CAS  PubMed  Google Scholar 

  16. Aranha AC, Eduardo Cde P, Cordás TA: Eating disorders part II: clinical strategies for dental treatment. J Contemp Dent Pract. 2008, 9: 89-96.

    PubMed  Google Scholar 

  17. Meurman JH, ten Cate JM: Pathogenesis and modifying factors of dental erosion. Eur J Oral Sci. 1996, 104: 199-206. 10.1111/j.1600-0722.1996.tb00068.x.

    Article  CAS  PubMed  Google Scholar 

  18. Hamasha AA, Zawaideh FI, Al-Hadithy RT: Risk indicators associated with dental erosion among Jordanian school children aged 12-14 years of age. Int J Paediatr Dent. 2014, 24: 56-68. 10.1111/ipd.12026.

    Article  PubMed  Google Scholar 

  19. Messias DC, Turssi CP, Hara AT, Serra MC: Sodium bicarbonate solution as an anti-erosive agent against simulated endogenous erosion. Eur J Oral Sci. 2010, 118: 385-388. 10.1111/j.1600-0722.2010.00749.x.

    Article  CAS  PubMed  Google Scholar 

  20. Lussi A, Jaeggi T, Zero D: The role of diet in the aetiology of dental erosion. Caries Res. 2004, 38: 34-44.

    Article  PubMed  Google Scholar 

  21. Wang X, Lussi A: Assessment and management of dental erosion. Dent Clin North Am. 2010, 54: 565-578. 10.1016/j.cden.2010.03.003.

    Article  PubMed  Google Scholar 

  22. Crow SJ, Peterson CB, Swanson SA, Raymond NC, Specker S, Eckert ED, Mitchell JE: Increased mortality in bulimia nervosa and other eating disorders. Am J Psychiatry. 2009, 166: 1342-1346. 10.1176/appi.ajp.2009.09020247.

    Article  PubMed  Google Scholar 

Download references

Acknowledgements

This study was partly supported by the JSPS KAKENHI Grant (Number 25463266).

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Mitsuhiro Otsu.

Additional information

Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

MO and AH designed the study. MO and YI collected and analyzed the data. MO wrote the Japanese manuscript. AH, HK, TI, and YY reviewed and analyzed the results. HK performed the English translation, and AH edited the manuscript. All the authors read and approved the final draft.

Authors’ original submitted files for images

Rights and permissions

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Otsu, M., Hamura, A., Ishikawa, Y. et al. Factors affecting the dental erosion severity of patients with eating disorders. BioPsychoSocial Med 8, 25 (2014). https://doi.org/10.1186/1751-0759-8-25

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI: https://doi.org/10.1186/1751-0759-8-25

Keywords