I've been using this recipe for homemade toothpaste for quite awhile and love how clean my mouth and teeth feel after using it. I always have these ingredients on hand and it's quick and simple to make, also cheap.
In a bowl I measure out 1/2 cup of baking soda, 1 tablespoon of 3% hydrogen peroxide, 1/4 teaspoon of tea tree oil, 10 to 12 drops of peppermint oil, and 12 drops of liquid stevia. It makes a drier paste than regular toothpaste. I really enjoy making my own products when possible.