Canker Sores: Causes, Symptoms, and Treatments

Canker sores are shallow, typically round or oval ulcers characterized by a white or yellowish center and a red border. They commonly form on the soft tissues lining the mouth, including the inner cheeks, lips, tongue, gums, and the roof of the mouth. These oral ulcers can be quite painful, particularly during eating, drinking, and speaking.

Here are the main types of canker sores:

Minor canker sores:

• The most frequently occurring type.

• Usually small and oval-shaped.

• Heal without leaving scars within one to two weeks.

Major canker sores:

• These are larger and deeper.

• Can cause extreme pain.

• May take up to six weeks to heal.

• Can result in scarring.

Herpetiform canker sores:

• These are uncommon.

• Often appear in clusters, ranging from 10 to 100 sores.

• Can merge to form one large ulcer.

• In severe cases, the presence of multiple open sores can elevate the risk of secondary infections, such as oral thrush.

The exact etiology of canker sores is not fully understood, but several factors are believed to contribute to their development:

• Injury to the mouth: This includes accidental cheek bites, dental work, and overly aggressive brushing.

• Certain foods: Acidic or spicy foods, such as citrus fruits and tomatoes.

• Nutritional deficiencies: Insufficient levels of Vitamin B12, Zinc, Folate, and Iron.

• Stress: Emotional tension and stress can act as a trigger.

• Hormonal changes: Fluctuations occurring during menstruation can be a factor.

• Underlying health conditions: Such as Celiac disease, Crohn’s disease, and HIV/AIDS.

• Family history: Genetics may play a role, as canker sores often show a familial pattern.

Most canker sores resolve spontaneously, but several remedies can help alleviate pain and expedite healing:

• Over-the-counter topical treatments: Gels or creams containing a topical anesthetic like benzocaine can help numb the area and provide temporary relief.

• Mouth rinses: Such as a saltwater solution, a baking soda rinse, or a mouthwash containing hydrogen peroxide can reduce irritation.

• Prescription medications: Used for severe cases, these include corticosteroid ointments or mouthwashes to reduce inflammation, and antimicrobial mouthwashes like chlorhexidine to prevent infection. For frequent or severe outbreaks, sucralfate or colchicine may be prescribed.

• Home remedies: Ice chips (sucking on ice can numb the area and reduce swelling), or a mixture of hydrogen peroxide and water. Small amounts of Milk of Magnesia can be applied to the sore to neutralize acids and soothe discomfort.

• Pain relievers: Over-the-counter pain relievers can help manage discomfort.

Complete prevention of canker sores is not always achievable, but certain practices can help reduce their frequency:

• Maintain good oral hygiene: Brush regularly with a soft-bristled toothbrush and floss daily.

• Avoid known triggers: Steer clear of foods or substances that have previously caused sores.

• Manage stress: Relaxation techniques such as yoga and meditation can be beneficial.

• Use mild oral care products: If you discover sensitivity to specific ingredients, consider using a toothpaste or mouthwash that does not contain sodium lauryl sulfate (SLS), as it can be a source of irritation for some individuals.

• Protect your mouth: Ask your dentist or dental hygienist about orthodontic waxes to cover the sharp edges of braces or dental appliances.

You should consult a doctor if sores persist for more than two weeks or if you experience unusually large or painful sores. If sores recur frequently, a visit is also warranted. Other reasons to see a healthcare professional include difficulty eating or drinking due to pain, or if sores are accompanied by a high fever or other unusual symptoms.

Canker sores are small but painful lesions that develop inside the mouth. They are common and not contagious, yet they can cause significant discomfort. While the exact cause remains unknown, identified triggers include injury, stress, and specific foods such as acidic or spicy items. Nutritional deficiencies, like low levels of Vitamin B12, Zinc, Folate, or Iron, can also be a contributing factor. Canker sores typically resolve on their own within one to two weeks, but sometimes a visit to a healthcare professional is necessary, for example, if sores last longer than two weeks or if they are unusually large or painful.

Treatment options include over-the-counter topical applications and mouth rinses. Prescription medications are available for severe cases, so discuss these with your dentist or dental hygienist. If you find yourself sensitive to certain ingredients, you might also consider toothpastes and mouthwash that do not contain sodium lauryl sulfate, which can be an irritant for some.

Common oral health issues can include cavities and tooth decay, gum disease, staining, and sensitivity. The primary culprit for these problems is often plaque buildup—a sticky film of bacteria that forms on teeth. If left untreated, plaque buildup can contribute to oral disease. By adhering to a comprehensive oral care routine, you can proactively address these issues, fostering a stronger, healthier smile:

• Protect Your Smile with Crest Pro-Health Toothpaste: Ensure you brush twice a day with a stannous fluoride toothpaste. Not only does it help combat cavities and tooth decay, but a Crest toothpaste formulated with stannous fluoride also strengthens enamel, fights sensitivity, and provides 24-hour protection against plaque buildup with twice-daily brushing.

• Rinse with Crest Pro-Health Mouthwash: Swish with an antibacterial mouthwash to rinse away loosened plaque, support gum health, and leave your mouth feeling clean and fresh.

• Brush 2X/day with an Oral-B iO Electric Toothbrush: An electric toothbrush, such as an Oral-B iO, helps remove 100% more plaque than a regular manual toothbrush. Its dentist-inspired round brush head envelops each tooth, adapting to the curves of teeth and gums to ensure a cleaner, healthier smile—even in hard-to-reach areas.

• Complete your oral care ritual by flossing at least once daily with Oral-B floss. Flossing is crucial for reaching the tight spaces where food particles and plaque accumulate. By meticulously removing these odor sources, you ensure every surface of your teeth is clean, contributing to an undeniably fresh and clean smile

By following a thorough oral care routine at home and visiting your dental professional at least twice a year, you can reduce the risk of developing tooth decay, gum disease, and protect your smile for years to come.