BS, If you're a bit iffy about the value of extra fluoride, there is a product on the market called Tooth Mousse that contains a milk protein that remineralises your teeth, ie it actually makes the enamel on your teeth stronger. I used it for a while and it did wonders. In any case, if your teeth are poor you should be seeing the dentist pretty regularly so chat to them as it could be a case of just using a different toothpaste or getting your teeth cleaned more often.