You mean the broken tastebuds? Like if you get a tiny bump on your tongue? I disinfect my nail clippers, clip it off, and disinfect again Doesn't hurt as much as you'd think, and it heals over pretty quick so it doesn't hurt for as long as it would if you just let the bump stay.

I get canker sores too, they freaking suck. In fact, two weeks ago I bit the inside of my lower lip hard core, like really hard core. There's still a deep cut there, and it hurts like a mother