My mouth frequently gets sores.

I think I tend to feel that way when I'm tired.

My mouth is still sore now, and it stings every time I eat.

My teeth are still uncomfortable, and I keep touching them even when brushing, so they don't heal well. I bought a liquid called Albochil at the pharmacy.

It stings and hurts a lot when I apply it. While it helps it heal a bit faster, I want to find and address the root cause. Is there a good way to do that?