Also see Hello toothpaste (not affiliated) which has fluoride but not SLS: https://www.hello-products.com/products/naturally-whitening-toothpaste https://www.he

Also see Hello toothpaste (not affiliated) which has fluoride but not SLS: https://www.hello-products.com/products/naturally-whitening-toothpaste https://www.hello-products.com/products/naturally-whitening-... Same problem for me, constant canker sores. Switching to Hello hasn't totally eliminated them, but it has reduced them.