Bulimia is an eating disorder in which people binge-eat large amounts of food followed by purging. Purging behaviour might include: vomiting, fasting or engaging in other behaviours like using laxatives or exercising to excess. This is done to rid their bodies of all the extra calories. These constant cycles of binge-eating and purging adversely affect the heart, kidneys, and other organs. But it can be especially damaging to dental health.