I was positively surprise with this product. I feel like it has made a positive change. However, the trays are a bit messy to use.

Will order again, used it 4 days instead of 3 that suggested, made my teeth very white and coated. was skeptical but it douse actually repair early signs of enamel erosion. I suggest take photos using flash before and after to see results. 

I’ve had good results with this product. It’s simple and quick - just 3 minutes for three days each month. I had noticeably less tooth sensitivity after the first three days and my teeth feel super smooth. I use the daily toothpaste too to maintain the effect. This has worked well for me.