If I had to choose between a comb and this one I would choose a comb that costs more but I think it works better and has better adhesion. Don't expect too much from whitening strips, they can do just that. The strips will begin to expand. You can even taste them after swallowing some saliva.
Get a Brighter Smile with EZGO Teeth Whitening Strips - 28 Count 14 Days Course, Bonus Shade Guide Included - Advanced New Formula, 6% HP - Whiten Your Teeth Faster!
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