Nerve endings: Silver nitrate, sulfuric acid, or citric acid are common medications applied to a canker sore. It chemically cauterizes the nerve endings in the area. The result is a potentially longer lasting ulcer but it doesn't hurt during the healing period.
Answered 8/26/2017
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Yes and no: Silver nitrate causes pain relief by burning the surface tissue of the ulcer, then it heals. Placing a protective ointment is another option to cover the ulcer while it is healing and can be obtained from your dentist.
Answered 11/27/2017
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