To rinse or not to rinse? You might be brushing your teeth wrong.

Any good dentist would tell you that oral health starts with brushing teeth. It’s a habit ingrained in us since early childhood, and as adults, the routine hasn’t changed much. Add a pea-sized amount of toothpaste and gently brush in soft circles for at least two minutes. It’s the two minutes after brushing that’s stirring up discussion on TikTok. Many people rinse their mouths after brushing their teeth, but some TikTokers argue it’s healthier to only spit out the excess toothpaste.

Spitting instead of rinsing toothpaste gives fluoride more time to assist with the remineralization process—especially since tooth enamel cannot grow back once it is completely destroyed. Woodis recommends everyone spit instead of rinse, especially among people at high risk for cavities. “We’ll prescribe an extra-strength fluoride toothpaste, and we often recommend that people spit and not rinse that prescription toothpaste.” If you’re a mouth rinser, spitting may not sound the most hygienic.

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A beginner-friendly guide to the perfect push-upJocelyn Solis-Moreira (she/her) is a science contributor at Popular Science. She covers a range of topics, including neuroscience, climate change, mental health, and infectious diseases. When Jocelyn’s done writing for the day, you’ll find her flying through the air in an aerial studio.
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