for me the effect wasnt tat fast and obvious in 2 weeks like the
advertisement says, maybe bcos my stains r darker. i use for abt 2
mths bah, b4 i see the effect. i oso got buy the colgate total plus
whitening to use as well as recommended. then i oso got wipe the
saliva off my teeth b4 applying although they didnt say so bcos i
feel the gel will hav more direct contact wif my teeth.
as for the tooth sensitivity, i did feel some soreness in my tooth
when i take cold foods, but it disappears aft some time.