I’m running out of toothpaste and thinking about switching to a natural brand, like Tom’s of Maine, Jason or Kiss My Face, but I’m wondering what the deal is with fluoride? Some brands advertise proudly that they have it, others that they don’t. It seems certain levels of it are good for you, but too much is a bad thing. Also, I’m currently using Sensodyne, and am wondering whether more or less fluoride would affect my sensitive molars? Anyone able to comment?