How much toothpaste ?
For children under age 3: Brush teeth with a smear of fluoridated toothpaste. With this minimum quantity, it is safe without spitting.
For children over age 3: Use a pea-size amount and encourage your child to spit it out after you brush.
When your child can hold a toothbrush, it’s time to start learning how to brush. Let your child watch you brush your own teeth. Children enjoy trying to do what their parents do. You might even want to let your child try brushing your teeth—or a favorite plush toy’s teeth.
Be sure to monitor your young child’s brushing. After your child practices brushing his or her own teeth, finish the job by brushing your child’s teeth. Children need help brushing until their dexterity improves i.e they are old enough to tie their own shoelaces or have an improved hand writing, which is usually around age 7 or 8.
Brushing should last for at least two minutes. You can make it a fun time together. For example, you may want to play a favorite song while brushing or tell jokes with your child before and after