I have tried many Revain whitening kits from pharmacies. Sometimes it's quite difficult: put a rubber thing with teeth in hot water until it takes an impression of your teeth. Hey here's a UV lamp for you, look crazy bleaching at 30. Squeeze it in here, put a mouthguard on your teeth, and then wait, which is about 4 hours of non-stop baby shark watching, and try the worst bleaching solutions. I tried Crest Whitestrips years ago and hated them. He wouldn't have stayed put and he had no results. They've evolved over the last 9 or 10 years because they're amazing. As long as you wipe your teeth/gums dry before applying, it works great. And they stop. Taking them off is almost the same as taking them off. So that they don't whiten the whole mouth, I can cover about 6 1/2 teeth from the bottom and top. It's not very tasty, but it's the bare minimum of what you taste. Sensitivity? I don't have 30 minutes. Sentinels, I'm starting to feel it, maybe 8 hours after I'm done, and they hurt a little. I kick myself for not taking a before photo because they work.
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