Yup, fluoride in toothpaste is indeed pretty efficient. And apparently more of it the better. There are even benefits of using stronger fluoride concentrations

Yup, fluoride in toothpaste is indeed pretty efficient. And apparently more of it the better. There are even benefits of using stronger fluoride concentrations than just regular toothpaste's 1400-1450 ppm. Humble old fluoride seems to work better than fancy calcium sodium phosphosilicate (also known as NovaMin): "The purpose of this in vitro study was to evaluate the effect of toothpastes containing sodium fluoride in different concentrations or a calcium sodium phosphosilicate system on pre-softened dentin demineralization and remineralization. Under these experimental conditions, the high fluoride toothpastes promoted remineralization and inhibited demineralization more effectively, than the 1450 ppm F, the non-fluoridated (control) and the calcium sodium phosphosilicate toothpastes." http://www.ncbi.nlm.nih.gov/pubmed/20546825 http://www.ncbi.nlm.nih.gov/pubmed/20546825 https://en.wikipedia.org/wiki/NovaMin https://en.wikipedia.org/wiki/NovaMin There are special high-fluoride gels used by dentists / dental hygienists / can be bought in pharmacies; they can help a lot if you have sensitive teeth.