9. Eating or digestive disorders.
The frequent vomiting associated with bulimia leads to stomach acids wearing away at the surface of the teeth, according to the ADA. Acid reflux can have the same effect, Ribeiro says.
10. Sinus infection.
A sinus infection can make your teeth hurt because of the pressure and inflammation of the sinuses swelling. You may suspect a sinus infection if your teeth and your head hurt more when you lean over with your head down, Price says.