Starting at age 2, you can begin teaching your child to brush with a children's toothbrush and no more than a pea-sized amount of fluoride toothpaste. But remember, children will need help with this important task until about age 6, when they have the fine motor skills to do an effective job themselves.
It's also extremely important to start encouraging healthy dietary habits at this time. Your child will have less plaque buildup and decay if you place limits on soda and sugary snack consumption. As a parent, you can model this behavior to instill it in your child. After all, monkey see, monkey do! Any sugary treats that are allowed should come at mealtimes, not in between. This will ensure your child is not creating favorable conditions for oral bacteria to grow around the clock.
At your child's regular, twice-yearly dental checkups and cleanings, topical fluoride can be applied to strengthen tooth enamel and make it more resistant to erosion and decay. If necessary, dental sealants can be applied to the back teeth (molars) to prevent food particles and bacteria from building up in the tiny grooves where a toothbrush can't reach.