An antiseptic with broad-spectrum antibacterial and antiviral action, it's especially helpful for treating mouth sores, which could be caused by a bacterium, a fungus, a virus or an allergy. Gargle with calendula tea or goldenseal tea to help canker sores heal. Let this mixture steep for ten minutes. Strain it so that there is no herb left in the liquid. Use this tea as a mouthwash three or four times daily.
Myrrh contains high amounts of tannins.
Powdered myrrh is useful for the treatment of mild inflammations of the mouth. Myrrh had been used as a traditional remedy for mouth and gum irritations. Some herbalists suggest mixing 200-300 mg of herbal extract or 4 ml of myrrh tincture with warm water and swishing it in the mouth two to three times per day. Alternately, you can open a capsule and dab a little directly on the sore. Try placing a spent tea bag on your canker sores.