In the US and Germany they say there is no solid evidence suggesting that they keep what they promise. I personally use what seems to be an Italian brand called

In the US and Germany they say there is no solid evidence suggesting that they keep what they promise. I personally use what seems to be an Italian brand called Biorepair and they clearly help with my tooth sensitivities(I have a bad habit of chewing on my nails when stressed). Biorepair seems to have split into an Italian version and a German version with less active ingredients called Bioniq. The Italian versions seems to add xylitol. https://www.amazon.com/s?k=biorepair&i=hpc&crid=3BEZX0VR8DUDG&sprefix=biorepair%2Chpc%2C337&ref=nb_sb_noss_1 https://www.amazon.com/s?k=biorepair&i=hpc&crid=3BEZX0VR8DUD...