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No, you're not supposed to leave it in contact with your teeth for any period of time. If you do, you will start swallowing it. Swallowing it will cause stomach
by OutOfHere 2y ago
No, you're not supposed to leave it in contact with your teeth for any period of time. If you do, you will start swallowing it. Swallowing it will cause stomach and cause other problems too.
The reason is that sodium fluoride which exists in toothpastes is associated with testicular and hormonal dysfunction in males - refer to PMID 30165274.