Nutrition Foods that have no known decay levels will include fish, poultry and meat along with fats and oils. Foods that can actually prevent decay will include cheeses and nuts. The higher the carbohydrate content the higher the potential for decay, foods such as cakes, crisps, biscuits, ice cream, dried fruits and white bread should all be limited. Fizzy drinks, fruit juices and some canned fruit are potential contributors towards tooth decay. Fast foods, which are loved by children and teenagers, are also potential risks towards tooth decay and obesity and should be limited.