Bulimia

The dental changes seen in many people with bulimia are often recognizable. Frequent vomiting may cause your salivary glands to swell and the tissues of your mouth and tongue to become dry, red and sore. People with bulimia may have chronic sore throat and small hemorrhages under the skin of the palate.
Frequent vomiting can erode your tooth enamel, especially on the tongue side of the upper front teeth. This sharply increases the risk for decay in these areas and can make these teeth sensitive to temperature. Severe erosion can lead to changes in your bite, or the way your upper and lower teeth come together. Your back teeth can be reduced in size and some teeth can even be lost eventually. Tooth erosion can take about three years to become obvious, but not all bulimics experience it.
Many people with bulimia may be malnourished, which can cause anemia, poor healing and increase the risk of periodontal disease.