text: 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!  :)\n\nAlso, using a whitening toothpaste (I like Crest but there are others out there) 2X a day will help keep them white after the strips.