Canker sore – Diagnosis and treatment – Mayo Clinic

Debacterol is a topical solution designed to treat canker sores and gum problems. By chemically cauterizing canker sores, this medication may reduce healing time to about a week. Silver nitrate — another option for chemical cautery of canker sores — hasn’t been shown to speed healing, but it may help relieve canker sore pain.

https://www.mayoclinic.org/diseases-conditions/canker-sore/diagnosis-treatment/drc-20370620