I also have a slight case of receding gumline but I don't know if that would make a difference or not.
Please help!
Suggestion:
Often times people experience sensitivity while whitening. Use the strips less often… If you are using them everyday cut back to every three days. Also use a fluoride rinse like ACT or Fluorigard. If the over the counter solution doesn't work call your dentist and ask for a prescription for fluoride (Prevident). The prescription fluoride gel is the best bet for reduction of sensitivity if you are still going to whiten.

{ 3 comments… read them below or add one }
it may be due to a cavity. bad cavity. you might have to get root canal. but it may just also be from not brushing your teeth. go to your dentist and find the problem…..best of luck ;DDDDD
Stop using it and go to the dentist, tell him what happened, I didn't go to dental school, sorry
ITS BECAUSE OF THE RECEEDING GUMS SORRY YOU COULD TRY TO MAKE A PASTE OF BAKING SODA TO SOOTHE IT