Here’s some remedies that are helpful for canker sores:
Arsenicum album: A person who breaks out in burning, painful mouth sores, and also feels anxious and tired, is likely to benefit from this remedy. Hot drinks often ease the pain, and the person feels best when keeping warm. They often have unhealthy, easily-bleeding gums, and tend to be extremely neat and tense. Arsenicum album is recommended when the mouth is dry and burning, and the ulcers are soothed by warm water. Restlessness and anxiety are felt. Often caused by stress and worry.
Borax: This remedy is often helpful when canker sores feel hot and sensitive. Sores may break out on the inside of the cheeks, on the gums, and on the tongue. Produces profuse saliva, yet still feels dry inside the mouth. Other indications are: sensitive to noise, suffers from motion sickness, bleeding ulcers when touched, and hot and tender mouth.
Calcarea carbonica: This remedy is often indicated for infants and small children who suffer from recurrent canker sores. Other indications are: head-sweats during sleep, and slow to teethe or learn to walk. May also canker sores in adults who are chilly, stout, and easily fatigued.
Hepar sulphuris calcareum: This remedy may be indicated when a person develops painful mouth sores that become infected-with pus formation, extreme sensitivity, and aggravation from cold drinks. Often feels extremely chilly, vulnerable, and oversensitive.
Mercurius solubilis: This remedy is useful when bleeding gums, a swollen coated tongue, and offensive breath are seen along with canker sores. The sores feel worse at night, and salivation is profuse, with drooling during sleep. The person tends to sweat at night and is very sensitive to any change in temperature.
Natrum muriaticum: Pearly sores that erupt inside the mouth, especially on the gums or tongue, may respond to this remedy. The mouth feels dry, and the tongue may have a tingling feeling. Often troubled by cold sores around the corners of the mouth or chin, and have chapped or cracking lips. A craving for salt, strong thirst, and a tendency to feel worse from being in the sun are other indications for Natrum muriaticum.
Nux vomica: A person who needs this remedy may break out in canker sores after overindulging in sweets, strong spicy foods, stimulants, or alcoholic beverages. The person may have swollen gums, a coated tongue, and bloody salivation. Irritability, impatience, and a general chilliness are often seen.
Sulphur: For sores that are painful, red and inflamed, with burning pain that is worse from warm drinks and aggravated by heat of any kind. The mouth may have a bitter taste; the gums can be swollen and throbbing. Reddish lips and mucous membranes, and a tendency toward itching and skin irritations are other indications.