In use for almost a year, still works. I originally only wanted this for red LEDs. As it turns out, blue LEDs kill morning breath, clear plaque from tongue and naturally whiten teeth when using peroxide gel. I never used the gel with these lights because many years ago I had a strong sensitivity to it that was unbearable. Red LEDs help with tooth sensitivity and gum health. I have used the light 2 or 3 times in a row, each session lasted about 10 or 15 minutes while watching TV or surfing the internet at night WITHOUT LIGHTENING. When I woke up the next morning, my breath was still fresh. I couldn't believe it and I never expected it to happen as I was really trying to help with gum disease. The effects of the morning breath lasted for several months before I had to do it again. While not a permanent cure for morning breath, it lasted me for several months! I still use these dental lights and now have several sets, some cordless and some corded. I will never be without these red and blue mouthpieces! It still works fine for me, I just wish it came with a case although I was able to find it in 4 x 3.5" here at Revain. If you don't believe me about the light you can google phototherapy. Blue LED lights are a proven remedy for acne because they kill bacteria. Red lights help with bone, tissue, inflammation, and maybe even bacteria for at least a year, with no end in sight.
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