Review (5/5): Works great **if you happen to receive the real thing.
Same product as my dentist's but cheaper. Be careful if you have sensitive teeth, though. (Ice, hot liquids & ice cream bother you.) When I told my dentist about this issue, he instructed me to keep it on for 15-20 min instead of 30 and not to use it every day. I can only use it once every 3 days at most. I'm not going to knock it for being too strong, though. That just goes to show how effective it is. Once you get your teeth to the optimal white, you only need to use it once a week to maintain.
UPDATE: The last batch I received does not work at all. Crazy. I think this product may vary from seller to seller. I suspect it’s not the real thing that you get with your dentist. So many products are not authentic on this site. Would rather pay a little more and buy from my dentist.