I used to use 10% I guess and decided to up my game for faster results. According to other reviews I only left this for 45 minutes. I felt a slight tingling sensation on the upper gums between my front teeth but it went away within minutes. When I took out my mouthguard, I noticed to my surprise that the gum line area was pure white. It later turned blood red and took a long, painful week to heal. I'm sure it works great but I'm a little afraid to try again.
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