Sports Drinks Can Be Tough on Teeth While all sweetened drinks are bad for teeth, some energy and sports drinks may be worse, according to one study

Medications That Can Stain Teeth

The antibiotic tetracycline cause gray teeth in children whose teeth are still developing. Antibacterial mouthwashes -- containing chlorhexidine and cetylpyridinium chloride -- also stain teeth. Some antihistamines, antipsychotic drugs, and antihypertensive medications cause tooth stains, as can iron and excess fluoride. If bleaching doesn't help, ask your dentist about dental bonding, in which a tooth-colored material is applied to teeth.