I don't think that would be necessary. The only part coming into contact with the bacteria from your mouth is the drip tip. This is why vape shops can have tester setups and just hand out mouth guards so everyone can try while still keeping everything clean. Once the juice gets vaped by your atomizer, the heat kills any bacteria so the only areas that need to be continually cleaned (few times a week) are the parts that touch your mouth. Even if some saliva makes it down into the carto, the heat from the atomizer should kill any bad bugs. Just my. That being said, I dont think you could ever be too clean. I sterilize my glass and SS tanks in boiling water every few weeks because I am a clean freak and i have learned too much about the importance of sterilization while i was a nurse
If the bacteria that is causing a mouth sore is coming from the drip tip that only touched my mouth, doesn't that mean it is coming from my mouth? So I'm a little "fuzzy" on how it being on the drip tip is causing the problem.