text: do those white strips really work on your teeth?   crest whitestrips worked for me.  i did notice increased sensitivity to cold foods during the whitening process.  but my teeth weren't very sensitive before, so i didn't find it too uncomfortable.  the sensitivity went away after i finished using the strips, and my teeth are still whiter over 6 months later!  :)  also, using a whitening toothpaste (i like crest but there are others out there) 2x a day will help keep them white after the strips.