When my oldest daughter was 7, she would save her candy for weeks, eat one little piece at a time, and always ask before she ate any. Candy is the focus of many special days such as Easter, Valentines, Christmas and Halloween. Millions are spent advertising candy and store displays, in-school sweet shops and vending machines make it easily accessible. Sweets not only cost money when you buy them, but they also contribute to tooth decay and result in costly dental bills.
Education is the key.
Teach your child about nutrition using a conversational style rather than lecturing. Talk about foods, what's in them, why some are good for your body and others aren't. Talk about why it's important to care for their bodies and teeth. My nephew recently learned about the problem of dentures when his grandfather coughed so hard his false teeth flew out and went under the car. Encourage your child to brush their teeth after every meal.