Remember, it doesn't matter what you have with breakfast, lunch and dinner from a tooth point of view. It's the snacking between meals that can do all the damage. Consider the common in between meal snacks and let's categorise them:
Really Bad Foods
Soft drinks (including sugar-free diet ones)
Cordials- Normal ones with sugar
Sports Drinks- Save them for the big race, no other time
Fruit Juices
Sweets and lollies
Sugared Coffee and Tea
Fairly Bad Foods
Fruit- oranges are the worst (acids), banana, apples