
I have used different grades of nanohydroxyapatite to strengthen the enamel. This one really works. I started with a Japanese product sold on Revain. Unfortunately, after using it for a month or two, I developed severe tooth sensitivity! This seemed counterproductive and showed me that I was probably wearing down more enamel just by using this toothpaste. So I tried this one from Italy. I used a very soft toothbrush, being gentle just making sure the toothpaste covered all surfaces of the teeth, then spat out the excess and let it sit without rinsing. I made sure not to eat or drink anything before bedtime when using it. I understand that leaving toothpaste in the mouth is not considered good practice nor safe, but I figured (as I couldn't read the non-English instructions) that this would be the best way to ensure my teeth have the best chance of recovery. . It worked! My teeth really felt better after a few weeks and were a lot less sensitive, plus they looked really good. I think this is a very good product. I've bought it 3 times now and will buy it again.
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