Your teeth are precious; you have one set of baby teeth and one set of adult teeth, and that is it! Therefore, the importance of making sure that you look after your teeth and your oral health overall cannot be overstated. Some particular foods are especially notorious for rotting the teeth and generally causing a great deal of harm to your mouth; wherever possible, you should try to make changes to keep your teeth in top condition. 10 Foods to Avoid for your Teeth!