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.
It's not that your Rx is causing a stink, but meds carry with them dry mouth as a side effect. Saliva is essential to washing odor-producing particles free, so when there's less of it, odor increases. It's essentially the same reason you get morning breath, according to the Mayo Clinic.