Zero Waste Toothpaste, y'all!
It is so simple and sooooo affordable. All you need is baking soda and coconut oil. BOOM! That is all. Add some essential oil for flavor, if you like. I prefer peppermint. Go wild. Make a batch for your besties. For your mom. You can make some to leave in your locker so you don't have stanky breath after lunch.
Or be a rebel and just brush with baking soda. Doesn't get much easier than that!