How much is enough? By their article, it appears that just a partial smear across the toothbrush is enough. One other important thing to note, is that parents should be helping their children brush until they develop the dexterity to brush themselves. Encourage your child to spit after brushing early on so that they do not swallow too much toothpaste. When you initially start brushing with them, only use water and have them practice spitting that out first, then move onto toothpaste.
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*Image from ADA and NY Times