don't get the pro or premium or those other kinds. stick with the classic which is the cheapest one.
it's about $20. WELL worth the money
just make sure you follow the directions because my friend used a 2 week supply in 1 week and it made his teeth really sensitive. i followed the directions and had no problems or complications at all
I used them, they were ok...gave my teeth hell though, and the whitening isn't that prominent. Might do another box though.
Advice!
If you do take them, the morning strip won't hurt at all.
But, if you give the night strip and hour to settle after you use it, you'll want to die. Sleep right away after.
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