I've been using fluoride free, SLS free, mint free, flavor free toothpaste for several months now. I've seen no difference on my lips. But I guess everyone has different sensitivities. Like I just found out I'm allergic to cinnamon. The doctor rubbed a little on me and it swelled up in a bump. Well shoot.. I hear cinnamon is in everything including most tomato based products (like ketchup), most mexican foods, most indian foods, many colas.. etc. And it's always listed in the ingredients as just "spices". No wonder my lips won't heal.