I posted some of this on a different section of the forum:
I have just recently visited my personal physician, optometrist, dental hygienist, and dentist, since switching 100% to the PV in January. I explained it and showed it to them, and they were all extremely interested and supportive. They all asked me to write down contact information so they could research these devices to describe to other patients. Naturally I put this forum on the list!
My hygienist immediately mentioned that my gums had already started to fill in the recessions that resulted from continual smoking, and were much pinker due to increased supply of oxygen and blood.
She also noted the slight additional bleeding, which she said was to be expected as the blood supply improved in the previously damaged tissue. She had the dentist write me a prescription for Peridex mouthwash to temporarily help with this.
I also asked specifically if the nicotine from the PV would cause more or less staining on my teeth, or whether the tobacco smoke was the main culprit. She stated that staining was chiefly caused by tobacco smoke and resulting tars, not nicotine, and verified that my teeth were less stained than in my previous visits over the last 10 years.
Note I started with RY4 PG for the first couple of weeks, but switched to JC VG (vanilla ice cream) and that is all I use now. Although I can vape either if necessary, the VG is much smoother to my throat.
Steve