Tooth brushing with a fluoride toothpaste helps prevent tooth decay. Half a pea-sized dab is about right for young children. Children can get fluoride from many toothpastes and from some mouth rinses.
Monitor the amount of toothpaste that children use. Excess ingestion of fluoride can lead to staining of the teeth called fluorosis. While this staining does not make teeth weak, it can be unattractive.