Just because a treatment works doesn't mean it's the best treatment, or is treating the "cause." To say that a lack of fluoride is the cause of their bad teeth is silly. Not eating sugar/acidic foods, Novamin, or a different set of bacteria in her mouth would also improve her teeth.

We used a toothpaste with novamin in it. That didn't help her. She doesn't eat much sugar. She's 40 something kg and eats very healthy.