Percocet contains oxycodone, a Schedule II controlled substance. As an opioid, Percocet exposes users to the risks of addiction, abuse, and misuse [see DRUG ABUSE AND DEPENDENCE]. Although the risk of addiction in any individual is unknown, it can occur in patients appropriately prescribed Percocet.
Use a waterpik! It is a miracle for cleaning under the gumline and in between teeth. You'll actually smell that awful smell coming out, but do it 2x a day and it'll fix that kind of odor. Don't forget, it doesn't replace flossing. All pharmacies and walmart, etc sell them.
Re: Loss of smell and horrible taste/smell in mouth and nose. Nasonex or Flonaise helps with allergic causes in the absence of other medical reasons. Sinuses tend to constrict in the presence of pollen, dust, and other allergens. Allergies would be a prime cause, but you doctor is the only one who can get to the root cause.