Mouth ulcers are small, painful sores that develop inside your mouth. They can appear on your gums, tongue, inner cheeks, lips or the roof of your mouth. While they’re usually harmless, they can make eating, drinking and talking uncomfortable.
Most mouth ulcers heal on their own within two weeks. However, if a sore lasts longer than three weeks, it may need medical attention.
What Is a Mouth Ulcer?
A mouth ulcer is an open sore that forms on the soft tissues inside your mouth. These sores often have:
A white, yellow or gray centerRed, inflamed edges
Tenderness or burning sensation
You might have just one sore or several at the same time.
Unlike cold sores, mouth ulcers are not contagious and cannot spread through kissing or sharing food.
Common Types of Mouth Ulcers
There are several conditions that can cause sores inside the mouth:
1. Canker Sores (Aphthous Ulcers)
These are the most common type. They often appear after minor injury, stress or eating acidic foods.
2. Oral Lichen Planus
White or gray thickened patches that may develop due to chronic irritation such as tobacco use.
3. Leukoplakia
White or gray thickened patches that may develop due to chronic irritation such as tobacco use.
4. Erythroplakia
Red patches inside the mouth that may require evaluation, as they can sometimes be precancerous.
5. Oral Thrush
A fungal infection caused by yeast overgrowth, leading to creamy white patches and soreness.
6. Oral Cancer
Sores that do not heal within three weeks should always be evaluated by a healthcare provider.
Symptoms of Mouth Ulcers
Typical signs include:
Round or oval sores inside the mouth
Pain or discomfort when eating or brushing
Swelling around the sore
Increased sensitivity to spicy or acidic foods
In more serious cases, additional symptoms may include fever or digestive issues.
What Causes Mouth Ulcers?
There are many possible triggers, including:
Accidental biting of the cheek or tongue
Dental procedures
Braces or dentures
Stress and lack of sleep
Hormonal changes
Acidic or spicy foods
Harsh toothpaste
Vitamin deficiencies (such as B12, iron or folate)
Certain health conditions can also contribute, including autoimmune disorders and digestive diseases.
Are Mouth Ulcers Dangerous?
Most mouth ulcers are harmless and temporary. However, you should see a doctor if:
The sore lasts longer than three weeks
Ulcers keep returning frequently
You experience severe pain
The sore appears unusually large
You develop fever or diarrhea
The ulcer is painless but persistent
Persistent sores can sometimes signal an underlying health condition.
Treatment Options
Medical Treatments
A healthcare provider may recommend:
Antiseptic mouth rinses
Pain-relieving gels
Steroid ointments
Medication for severe or recurring ulcers
Home Remedies
You can reduce discomfort by:
Rinsing with warm saltwater
Drinking plenty of water
Avoiding spicy and acidic foods
Using a soft-bristled toothbrush
Maintaining good oral hygiene
How Long Do Mouth Ulcers Last?
Most sores improve within 10 to 14 days. If healing takes longer than three weeks, medical evaluation is important.
Prevention Tips
While mouth ulcers can’t always be prevented, you can lower your risk by:
Brushing and flossing daily
Eating a balanced diet
Reducing stress
Staying hydrated
Scheduling regular dental checkups
Final Thoughts
Mouth ulcers are common and usually not serious. Still, persistent sores should never be ignored. If a sore doesn’t heal within a few weeks, consult a healthcare provider to rule out more serious conditions.
Taking care of your oral health can reduce discomfort and help prevent future outbreaks.