Believe it or not — dentists recommend squeezing just a pea-sized amount of toothpaste onto your toothbrush!

As for kids under age 3, only a "smear" of toothpaste is required—about the size of a rice grain, according to the United States' Centers for Disease Control and Prevention. This is to ensure they don't accidentally swallow a lot of fluoride toothpaste, which is not supposed to be ingested.