Sugar, sweets and chocolate give you and your child cavities. Tooth decay is a disease and the consequences include pain, big dental bills, and many bad things you would never want for your child. get rid of all the candy and sweets in your house. tell your child that sweets have tiny bugs in them that eat holes in your teeth and he should not eat any of it. If you don't make a firm commitment now, you will regret it. Tell him if he ever eats sweets, he must rinse the bugs out with a lot of water. Teach him about fruits. they are sweet and they don't have bugs in them. Tell him you will buy him all the fruits he wants and let him taste a lot of different ones and always have some in the house. The bugs actually do form after you eat sweets but that is too complicated at his age. Also, you can buy sweets made with Xylitol which is all natural, tastes like sugar, and won't give him cavities. Tell him this is the only candy without bugs.