This is the second time I bought this. This time it is for stocking stuffers. I bought it for myself (both times from OVERSTOCK, OF COURSE!!). I still cannot believe how strong, effective, and reasonable it is. The first time I used it, I left it on 5 minutes longer than directed..mistake on my part in the respect my teeth were so sensitive to heat and cold for two days! My bad. However, I cannot be happier with the whitener itself. It works FABULOUS. My teeth whiten up quickly...just use accordingly as it is strong. Will buy whenever I run out again. They give you ALOT though, so it wwill be quite a while. What a deal. I get tons of compliments! I duggest getting the professional trays done and skipping the high price from the dentist and buying it here. Another winner from Overstock!! Plus being an O gold member, I got free shipping! I LOVE OVERSTOCK and this was a no brainer deal. Buy it!
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