hi Pam my teeth (lowers) are also ultrasensitive enough to use the special pastes. I tried regular Crest Whitestrips for a about a week and quit because I simply forgot, but did not notice any pain. Most recently I got a free sample for these sticky strips from Wal-Mart that dissolve and want to try them at least on my top fronts. I use to rinse with peroxide even as a kid but find this to be too irritating for me. I don't use peroxide toothpastes either.

I guess once you have felt that nerve tingle-pain - you are forever cautious!! I went for my 6 month recently and am so glad to have teeth that are fairly white, healthy, straightened and all mine! (now if I could give up my morning coffee ) oh and the hygienist told me that the ingredient in Rembrandt toothpaste would not whiten but it would actually make the enamel a bit slicker and thus feel nicer and allow less plaque to settle even after swishing with water. $6 but I splurged on a brand name tube at Wal-Mart!

hope the trays work well with no discomfort - updates maybe?