It has been said that Calendula can help treat ulcers and canker sores.
Calendula flower petals can be used to make a tea that is taken internally for ulcers in the digestive tract. It can also be taken internally for painful menstruation.
Externally, the tea can be used as a gargle or a mouthwash for gum disease, sore throat, tonsilitis, and canker sores. The parts of the flower used are the petals.
As with anything regarding your health or treatment of any problems, please always consult your doctor first.