Taking Lysine (an essential amino acid) is a painless way to almost immediately get rid of ulcers. The first time I tried Lysine for this, I had a very painful ulcer on the side of my tongue. After taking just one tablet, it was gone in a few hours.
For mouth absesses pure salt will heal it within three days. It will burn though.
Gargle 2-3 times daily with Listerine. It will burn, but it cleans the ulcer and allows it to heal.
For mouth ulcers, use alum. Take a cotton swab and place alum on infected area.
Soak a cotton swab with cider vinegar and press gently on infected area (ulcer). May sting for a few seconds, but instant pain relief, and swelling and inflamation disappears immediately. Apply generously for a few days until healed.
Apply peppermint oil to the affected area.
Massage the gums with coconut milk and honey thrice daily.