A word for anyone considering: 1) This is a home shirt so have realistic expectations. If you're trying to get Hollywood results, I wouldn't say it will get you there. 2) The whitening gel causes irritation. If you get it on your gums (especially over a long period of time) it will be uncomfortable and irritate your gums. I have found that brushing your gums too hard before using the whitening kit makes it worse. Think peroxide in an open wound. 3) The better you apply the gel, the more experience you will have. I put a drop on each tooth and then inserted the mouthpiece. Less chance of smearing gums. 4) I have sensitive teeth. The strips in other brand kits hurt like crazy. I've been using this set daily in 10-15 minute increments with slow, positive results and no discomfort with this approach. Once I worked up the courage to do this for 30 minutes and my teeth hurt and my gums were irritated. All people are different. In general, I've seen noticeable results over time. Will my teeth glow in the dark like Ross Gellar? no No, they won't, but they look a lot better than before. All in all, it was worth the $40 I paid for the kit.
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