>>I gave up colgate etc long long time ago. UNfortunately I have to use fluoride tooth paste...
>
>I used to use Tom's without flouride and I think it was responsible for a spate of cavities I had in my 20's.

Doubtful. The main reason I've read for widespread reduction of cavities is fluoridation of the water supply.
And it looks to hold water, given that cavities are again on the rise and it corresponds nicely with the growth of bottled water sales.