Use only a smear of toothpaste (the size of a grain of rice) to brush the teeth of a child less than 3 years of age. For children 3 to 6 years old, use a "pea-size" amount of toothpaste and perform or assist your child’s toothbrushing. Remember that young children do not have the ability to brush their teeth effectively on their own. Children should spit out and not swallow excess toothpaste after brushing.