As we mentioned earlier, fluoride is used in most toothpastes, and this type of toothpaste should be used until adult permanent teeth are fully in. A pea-sized amount of toothpaste should be given to children above the age of three, and they must brush at least in the morning and the night. Make sure that your child knows to spit after brushing, and there should be limited water for rinsing after brushing so that all of the mineral doesn’t get stripped from the teeth. They should also not ingest this toothpaste.