i used the product for a week, and find it all so annoying (not just this brand but all of them) with the gunk and the prosthesis and all, so i can't say for sure i was that impressed. i have enough to try again when i get the courage to deal with the annoyance.
I used to by $12 per tube bleach from my dentist and they were about 1/3 the size of these tubes. A little goes a long way. Store in the fridge to make them keep longer. This is strong stuff. I can't bleach my teeth back to back days or I suffer from sensitivity. Product is great. Just use sparingly.
I used the tiniest dot of the teeth whitening gel on each tooth area in the tooth tray my dentist made for me. I kept it on for the recommended 45 minutes. I repeated this a couple of days later. The result was excellent - white teeth. It completely cleared up the little tea stains on my lower teeth, as well. This may be more than I need but I can share with my husband and adult boys.