Many people develop mouth ulcers during stressful times — exam season, an important interview, a big meeting. While these ulcers are generally harmless, they can cause real pain and discomfort. So what are they, and why do they appear? This article answers the most common questions about mouth ulcers.
What Are Oral Ulcers?
Mouth ulcers are sores that develop inside the oral cavity. They rarely indicate anything serious, but they can affect quality of life while they last. The good news: most oral ulcers are self-healing and clear up within one to two weeks.
What Does a Mouth Ulcer Look Like?
Mouth ulcers are usually oval or round and appear on the tongue, cheeks, or lips. They can look white, yellow, grey, or red. It’s possible to have more than one at a time, and they can grow. Many begin with a tingling, itching, or burning feeling in the affected area.
Types of Mouth Ulcers
Minor Ulcers
The most common type: small, oval-shaped, with a red edge. They generally last about two weeks and heal without scarring.
Major Ulcers
Less common and larger, usually round with defined borders (irregular edges when they grow). Major ulcers can be very painful, may take up to six weeks to heal, and tend to scar.
Herpetiform Ulcers
Uncommon, and usually seen later in life. These are very small sores that occur in clusters of 10–100 and can merge into one large ulcer with irregular edges. Like minor ulcers, they generally heal within two weeks without scarring.
What Causes Mouth Ulcers?
The exact cause isn’t fully understood, but research points to several risk factors:
- Trauma — forceful brushing, sports injuries, or an accidental cheek bite.
- Toothpaste ingredients — some toothpastes and mouth rinses contain sodium lauryl sulfate, which is known to trigger ulcers.
- Food — chocolate, strawberries, eggs, nuts, coffee, and cheese can trigger ulcers in susceptible people; so can diets lacking vitamin B-12, zinc, iron, or folic acid.
- Allergic responses
- Helicobacter pylori infection
- Hormonal shifts during menstruation
- Emotional stress, such as exams or interviews
- Chronic medical conditions
When Should I See a Dentist?
Most ulcers need no treatment beyond over-the-counter pain relief. But you should see your dentist if you experience any of the following:
- Unusually large ulcers
- Recurring ulcers, or ulcers that persist beyond two weeks
- Sores extending onto the lips or corners of the mouth
- Pain not relieved by over-the-counter medication
- Ulcers that make eating or drinking difficult
- Ulcers accompanied by a high fever
How Are Mouth Ulcers Treated?
Treatment targets the underlying cause. If ulcers come from trauma or aggressive brushing, a softer toothbrush and gentler technique help. If stress is the driver, addressing it is part of the plan. Dentists typically prescribe pain medication for comfort, and antimicrobial mouthwashes or steroid tablets when ulcers keep coming back.
How Can I Prevent Mouth Ulcers?
Ulcers can recur, but you can reduce how often:
- Manage your diet — avoid foods that irritate the mouth (nuts, chips, spices, very salty foods, and acidic fruits like pineapple, oranges, and grapefruit), and eat a balanced diet rich in vitamins, green vegetables, and fruit.
- Brush gently — use a soft toothbrush and avoid aggressive scrubbing.
- Keep up with checkups — regular visits catch recurring problems early.
If you’re dealing with painful or recurring mouth ulcers, Dr. Toksoy | Studio Dental NY can help — our minimally invasive general dentistry practice focuses on diagnosing and treating oral health issues before they become bigger problems. Book an appointment today.
