Hmm, I've honestly not had any trouble with that just yet. I use Fixodent powder. Apparently my dentist wants me to upgrade to paste at some point, but I don't see the point so long as this keeps working. I might try it after I use all of this up.
My only guess would be that maybe the denture's not snug enough, to your palette or your gums, but if you're getting sore spots from the rubbing, I don't see how that could be.
