Canker Sore Mouth, Raspberry Leaf for

"Infuse a handful of raspberry leaves in a half pint of boiling water for fifteen minutes; when cold strain and add two ounces tinc[ture]. of myrrh, rinse the mouth with a little of it two or three times a day, swallow a little each time until relieved. This is also good for spongy gums, loose teeth, bad breath and for gently correcting and cleansing the stomach."

Source: Mother's Remedies: Over One Thousand Tried and Tested Remidies from Mothers of the United States and Canada, T. J. Ritter