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How to Get Rid of Canker Sores: 14 Treatment Tips & Causes

A woman experiencing mouth and lip pain.
Canker sores are small, painful ulcers inside the mouth.Source: iStock

What are canker sores?

Canker sores (aphthous ulcers or aphthous stomatitis) are small, painful ulcers inside the mouth. They may occur on the tongue and on the inside linings of the cheeks, lips, and throat. They usually appear white, gray, or yellow in color, with a red border.

Canker sores are among the most common types of oral lesions, affecting about 20% of people. Women get canker sores more often than men. Canker sore susceptibility may be inherited, and the condition can run in families.

Canker Sore Symptoms & Signs

Some people may experience the following related canker sore symptoms and signs:

  • Bleeding gums
  • Lump or mass on gums
  • Painful gums

Learn more about symptoms and signs of canker sores »

A person with a canker sore on their lip.
Canker sores are not contagious and are categorized into three typesSource: iStock

What are canker sores types, and what do they look like?

Canker sorePicture of a canker sore (aphthous ulcer)

Canker sores are not the same as cold sores (fever blisters), which are an infection caused by the herpes virus and are contagious. Canker sores are not contagious, and are categorized into three types:

  1. Minor sores measure from 3 to 10 millimeters (mm) and are the most common type of canker sore. Lesions last 10 to 14 days and heal without scarring.
  2. Major sores are larger and deeper than minor sores, have an irregular border, and a diameter of greater than 10 mm. Major canker sores may take weeks to months to heal and can leave a scar after healing.
  3. Herpetiform sores are characterized by large groups of multiple sores. These are small ulcers (2-3 mm) but there may be as many as 100 ulcers present at the same time. They tend to heal without scarring.

A stressed out woman sits to drink coffee.
Some possible causes of canker sores include the following injury to the mouth may cause simple canker sores. An injury could be from vigorous tooth brushing, dental work, braces or dentures, or a sports accident.Source: Getty Images

What causes canker sores?

The cause of most canker sores is not well understood, and multiple factors may cause sores to appear. Some possible causes of canker sores include the following:

A image comparing a fever blister (cold sore) to a canker sore.
Canker sores are not the same thing as fever blisters (cold sores).Source: iStock

Are canker sores the same thing as cold sores (fever blisters)?

No, canker sores are not the same thing as fever blisters (cold sores).

Canker sores occur inside the mouth and are not contagious. Fever blisters are infections caused by the herpes simplex virus (HSV), they mostly occur on the lips and outside of the mouth, and they are very contagious.

A woman with her mouth open points to her inner cheek.
Common symptoms of canker sores include burning, tingling, or prickling sensation, soreness, ulcers, and difficulty speaking, eating, or swallowing.Source: iStock

What are signs and symptoms of canker sores?

Canker sores are painful sores inside the mouth. They may occur on the tongue, the lining of the cheeks, the gums, the inside of the lips, or the soft palate on the back of the roof of your mouth. Common symptoms of canker sores include the following:

  • A burning, tingling, or prickling sensation, up to 24 hours before the sore appears
  • Crater-like ulcers that are white, gray, or yellow in color, with a red border
  • Sores are usually painful
  • Difficulty speaking, eating or swallowing

Less common symptoms that can also indicate a more serious underlying infection include:

Contact your doctor or dentist if your canker sores are

  • Larger than usual
  • Spreading
  • Lasting more than three weeks
  • Causing severe pain even after taking over-the-counter pain medication
  • Causing difficulty drinking enough fluids to stay hydrated
  • Accompanied by fever

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A woman swishes her mouth with an oral rinse.
14 Home remedies can relieve the pain or irritation caused by the sore and heal faster.Source: Getty Images

What natural or home remedies cure canker sores?

In most cases, canker sores do not require any treatment, and there is nothing specific you need to do to get rid of a canker sore because it usually will heal on its own. Home remedies can be used to help relieve the pain and inflammation of canker sores.

If you already have a canker sore, there are home remedies that can be used to help relieve the pain or irritation caused by the sore and to speed healing:

  1. Topical medications applied directly on the sore, mouthwashes, and oral medications can relieve pain or inflammation.
  2. Allow ice chips to dissolve slowly in your mouth for relief of pain.
  3. Avoid acidic foods such as citrus fruits or spicy foods that may aggravate the sore.
  4. If there is any vitamin deficiency (a doctor can test for this), take supplementation as prescribed.
  5. Brush teeth gently and use a brush with soft bristles.
  6. Use toothpaste and mouthwash that does not contain sodium lauryl sulfate.
  7. Another home remedy is to mix milk of magnesia with Benadryl liquid and use it as a mouth rinse. You can also dab milk of magnesia directly onto the canker sore with a cotton swab.
  8. Rinse your mouth with salt water or baking soda rinse. Mix 1 teaspoon of baking soda per ½ cup water, and rinse.
  9. Other natural remedies include goldenseal mouth rinse, deglycyrrhizinated licorice (DGL) gargled in warm water, and saltwater rinses.
  10. Zinc lozenges may help provide relief and speed healing time. Do not give lozenges to young children, as they may be a choking risk.
  11. Vitamin C, vitamin B complex, and lysine can be taken orally when lesions first appear and may help speed healing.
  12. Infuse sage and chamomile herbs in water and use as a mouthwash four to six times daily.
  13. The herb Echinacea may help speed healing
  14. Carrot, celery, and cantaloupe juices may also be helpful.

Consult a health care professional before using any home remedy as many have not been scientifically tested or proven effective.


Canker Sores (Causes, Home Remedies, Treatment, and Prevention)
See a pictures of canker sores and cold sores as well as other oral health conditions
See Images

A woman reaches for a tube of oral gel on the drug store shelf.
OTC medications can cure canker soresSource: iStock

What topical prescription and over-the-counter (OTC) medications cure canker sores?

Topical gels or ointments are used for canker sores to relieve pain, decrease inflammation, and prevent infection.

  • Topical pain medications: Gels such as benzocaine (Orajel, Orabase) and lidocaine (an anesthetic) are used directly on the canker sore to relieve pain or discomfort. Canker sore patches (Canker Cover) provide pain relief while covering and protecting the sore as it heals. These types of medications can be found over the counter.
    Topical anti-inflammatory medications: Steroid medications such as triamcinolone acetonide or fluocinonide can be used topically to decrease inflammation from canker sores. These medications usually require a prescription and should be used exactly as your doctor or other health care professional has instructed.
  • Topical antibiotics: These medications may be prescribed by your doctor or dentist if there is a possibility of the canker sore becoming infected with bacteria. Redness, crusting, pus discharge, or fever are signs of infection.

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A woman carefully pours mouthwash into a small cup.
Several mouthwash solutions may be used to treat canker sore symptoms.Source: Getty Images

What mouthwash solutions be used to treat and cure canker sores?

Several mouthwash solutions may be used to treat canker sore symptoms, and include:

  • Diphenhydramine suspension (Benadryl Allergy liquid) is available over the counter and can be used as a mouth rinse because it has topical anesthetic effects on the tissue of the mouth and the canker sore. Put the suspension in your mouth, swish it around for 30 seconds to one minute, and spit it out. Do not swallow the rinse.
  • Anti-inflammatory steroid mouth rinses may be prescribed to help reduce inflammation of the sores.
  • Tetracycline antibiotic rinses may be prescribed and have been shown to relieve the pain and promote the healing of canker sores. Do not use tetracycline if you are pregnant, people allergic to tetracycline, or if the person with the canker sore is a child under 16 years of age.


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A woman describes canker sore pain to the dentist.
Predisposition to canker sores may just be genetic.Source: iStock

What oral medications are available to cure canker sores?

Several oral medications may help relieve symptoms of canker sores.

What should a person do if they get recurrent or chronic canker sores?

  • If a person suffers from frequent canker sores, there may be an underlying medical reason or illness that causes them. See a health care professional or dentist if there are any concerns that canker sores are frequent.
  • Predisposition to canker sores may just be genetic. However, some diseases that affect the immune system such as lupus, Crohn's disease, celiac disease, or HIV/AIDS may cause frequent or recurrent canker sores.
  • Health care professionals can order tests to determine if there is an underlying medical reason for a person's frequent canker sores.

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