What exposes your teeth to abuse is not how much you eat, but how often you eat. Every time you eat, bacteria convert the carbohydrates in the food into acids that can dissolve your tooth enamel. By snacking throughout the day, you make your teeth susceptible to constant bacterial attack. Hence avoid eating high sugar, high acid foods between meals. Diet soda may have no sugar but the acid in it can be dangerous to your tooth enamel. If you have a sweet tooth, it’s best to have sweets at meal times!