Mouth ulcers - commonly called canker sores - are small, painful lesions that form inside the mouth. While they are usually harmless, mouth ulcers can make everyday activities like eating, drinking, and speaking uncomfortable.
Most mouth ulcers heal on their own within one to two weeks. However, understanding the causes, types, and treatment options can help reduce pain and speed up the healing process.
If mouth ulcers occur frequently or last longer than expected, it may be worth discussing the issue with a dentist to rule out underlying causes.
What Are Mouth Ulcers?
Mouth ulcers are open sores that appear on the soft tissues inside the mouth. They commonly develop on the inside of the cheeks, lips, tongue, or gums.
Unlike cold sores, mouth ulcers do not occur on the outside of the lips and are not contagious. They usually appear as round or oval sores with a white or yellow center and a red border.
Although they can be painful, most ulcers heal naturally within about two weeks.
Types of Mouth Ulcers
There are several types of mouth ulcers, and each has slightly different characteristics.
Minor Mouth Ulcers
Minor ulcers are the most common type. They are typically small and round and appear on the inside of the lips, cheeks, or under the tongue.
These ulcers usually heal within 7 to 14 days without leaving scars.
Major Mouth Ulcers
Major ulcers are larger and deeper than minor ulcers. They can be significantly more painful and may take several weeks to heal.
In some cases, major ulcers can leave scars once they resolve.
Herpetiform Mouth Ulcers
Herpetiform ulcers are less common and appear as clusters of many small sores. These ulcers may join together to form larger irregular-shaped lesions.
They can occur anywhere in the mouth and may take several weeks to fully heal.
Common Causes of Mouth Ulcers
Mouth ulcers can develop for a variety of reasons. In many cases, they occur due to irritation or minor injury inside the mouth.
Some of the most common causes include:
- accidentally biting the inside of the cheek
- brushing too aggressively
- irritation from dental appliances or sharp teeth
- stress or hormonal changes
- vitamin deficiencies (such as vitamin B12, iron, or folate)
- acidic or spicy foods
- certain medications
In some cases, recurrent mouth ulcers may be linked to underlying medical conditions such as Crohn’s disease or celiac disease.
Foods That Can Trigger Mouth Ulcers
Certain foods can irritate the lining of the mouth and contribute to the development of ulcers.
Common triggers include:
- citrus fruits such as oranges and lemons
- tomatoes
- spicy foods
- coffee and chocolate
- vinegar or pickled foods
- very salty foods
If you frequently develop mouth ulcers, limiting these foods may help reduce irritation.
Maintaining a balanced diet rich in vitamins and minerals can also help support overall oral health.
Best Treatments for Mouth Ulcers
Most mouth ulcers heal on their own, but treatment can help reduce discomfort and speed up recovery.
Mouth Ulcer Gels
Over-the-counter mouth ulcer gels are commonly used to protect the ulcer and reduce irritation. Many gels contain ingredients that numb the area and relieve pain.
These products create a protective barrier that helps prevent irritation from food and drinks.
Topical Steroid Treatments
For more severe or persistent ulcers, a dentist or healthcare provider may recommend a topical corticosteroid treatment.
These medications help reduce inflammation and support faster healing.
Saltwater Rinses
Saltwater rinses are a simple and effective home remedy for mouth ulcers.
Mixing a small amount of salt with warm water and rinsing the mouth can help keep the area clean and reduce inflammation.
Prescription Medications
In rare cases where ulcers are severe or recurring frequently, prescription mouth rinses or medications may be recommended.
A dentist can evaluate the cause and determine the most appropriate treatment.
Home Remedies That May Help Mouth Ulcers Heal Faster
Several home remedies may help ease discomfort and support healing.
Common options include:
Ice
Applying ice or sucking on small ice chips may help numb the area and reduce swelling.
Aloe vera
Aloe vera has soothing properties that may help calm irritated tissue.
Honey
Honey contains natural antimicrobial properties and may help protect the ulcer.
Chamomile tea
Chamomile has anti-inflammatory properties that may help reduce irritation.
While these remedies may not cure ulcers instantly, they can help manage discomfort while healing occurs.
Mouth Ulcers vs Oral Cancer
Most mouth ulcers are harmless and heal within a couple of weeks. However, it is important to recognize when a sore may require further evaluation.
Key differences include:
Healing time
Typical mouth ulcers heal within 1–2 weeks. A sore that lasts longer than three weeks should be evaluated.
Appearance
Ulcers are usually soft with defined edges. Cancerous lesions may appear irregular, thickened, or raised.
Pain
Mouth ulcers are usually painful. Oral cancer lesions may not cause pain in the early stages.
If you notice a sore in your mouth that does not heal or continues to grow, it is important to have it examined by a dentist.
How to Help Mouth Ulcers Heal Faster
While mouth ulcers usually heal naturally, a few steps can help support recovery.
- avoid spicy or acidic foods
- brush gently with a soft toothbrush
- keep the mouth clean
- use protective gels if needed
- stay hydrated
If ulcers become unusually painful or continue to return frequently, a dentist can help determine the cause and recommend treatment.
When to See a Dentist for Mouth Ulcers
Most mouth ulcers heal without treatment. However, it is best to seek professional care if:
- the ulcer lasts longer than two to three weeks
- ulcers occur frequently
- the sore becomes unusually large or painful
- eating or drinking becomes difficult
A dental exam can help identify the cause and rule out more serious conditions.
Final Thoughts
Mouth ulcers are a common oral health issue that most people experience at some point. Although they can be uncomfortable, they are usually temporary and heal on their own.
Understanding the causes and treatment options can help reduce irritation and support faster healing. If you notice ulcers that do not heal or occur frequently, a dental evaluation can help ensure there are no underlying concerns.
