I’ve been whitening my teeth for the past year (estimating) and I love it. I don’t use any of that off-the-counter stuff like Crest white or anything like that, rather, I got my kit from my dentist.
The brand is Philips and it was about $200 CAN.
The first time you get everything it comes with about 6 tubes of teeth whitening and a retainer looking object that is custom made just for you (that’s what makes the whole kit expensive).
Refills after you finish the product is only $35 a tube.
All you have to do is put a pea sized amount on each tooth in the mold and pop it into your teeth. The version I had would require you to keep it in for 30 mins, following a quick brush with some toothpaste for sensitive teeth. The reason for this is because this type of toothpaste has a ingredient that coats the sensitive parts of the teeth.
The reason I chose to go through my doctor for this instead of Walmart is because I highly value my teeth and I know that that stuff is just junk. Not going to ruin my teeth to save a couple of bucks.