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."
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.
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
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.