Alright, I just went to our cupboard and found 3 brands that we have on hand:
Doctor Burt's (Burt's Bees) orange cream. No flouride. Ingredients: filtered water, vegetable glycerin, calcium carbonate (natural chalk), bentonite (natural clay), orange oil, sodium bicarbonate (baking soda), yucca extract, vegetable oil & beta carotene, xanthan gum.
Tom's of Maine. Silly Strawberry. No flouride. Ingredients: glycerin, water, calcium carbonate (chalk), hydrated silica, fruit extracts (strawberry, banana, and other natural flavors), carrageenan (seaweed), sodium lauryl sulfate (from coconut oil)
Earth's Best (JASON's). Strawberry and banana. No flouride. Ingredients: vegetable glycerin, aqua (purified water), xylitol, panthenol (vit. B5), cellulose gum, oat beta-glucan, calcium lactate, natural strawberry and banana flavor.
We haven't tried the Jason's one yet, but both of my dc like the other two just fine. They probably prefer the Silly Strawberry one. Neither foam up so the kids like that. We've been using natural toothpastes now for over 2 years and no cavities. In fact, the kids were just to the dentist yesterday and the dentist said their teeth are awesome!!