Eating disorders
There’s much to say about eating disorders, and it is quite a long topic to talk about, especially when we start discussing the side effects or consequences. One of them is tooth decay, and there’s a pretty much convincing explanation to it. Not every eating disorder is the same, but some of them have two different characteristics: people who are overeating, and people who are purging (or in other words, they provoke their own vomiting episodes after eating).
In other cases, they do not have enough food, which makes them susceptible to nutrient deficiencies that may speed up tooth decay. Overeating may result in keeping food particles constantly attached to the teeth, and vomiting constantly leads to erosion of the tooth enamel because your oral cavity and your teeth are not meant to withstand the acidity of your stomach contents.