RNC, strange mouth feelings are pretty normal. Your mouth chemistry changes, your blood flow changes, and orally something is missing. That said, don't worry, see a dentist tell them what's up... if it is a problem they will deal with it. If not, both you and the dentist have a baseline. I went in for a cleaning around day 170... my dentist was amazed at how much healthier my mouth and gums were (I chewed a can a day of Copenhagen for 35 years, and had my own mouth weirdness going on).
Beyond that, join a quit group* with people quit the same time as you... compare notes, read what quitters of more days say, get through the worries and on to freedom and better life.
* March 2016 (maybe February 2016) will get to 100 days quit same time as you. 5 days alone is bad ass! Stay quit by joining a group and take a load off. ** note, I see you posted roll already!!! Outstanding!