Oral Health Library · 10 min read
Muh Ke Chale Kaise Thik Kare? A Simple Guide to Mouth Ulcers
Most small mouth ulcers heal within one to two weeks. Soft food, gentle brushing, and avoiding spicy, sour, or very hot food can reduce irritation while they heal. An ulcer lasting beyond two weeks, or one with a lump, numbness, unexplained bleeding, or difficulty opening the mouth or swallowing, needs an in-person examination.
Written and medically reviewed by
Dr. Bipin R. Upadhyay
BDS · MDS Oral Medicine & Radiology · PhD Scholar · Associate Professor & Head, Department of Dentistry
Last clinically reviewed: 2026-10-26
Key points
- Most small mouth ulcers heal within one to two weeks.
- Gentle brushing, soft food, and avoiding irritants can improve comfort.
- Do not scrape ulcers or apply harsh household products.
- An ulcer lasting beyond two weeks needs an in-person examination.
- Seek earlier care for a lump, numbness, unexplained bleeding, or difficulty opening the mouth or swallowing.
- Frequent or unusual ulcers may need assessment for an underlying cause.
What are mouth ulcers, or muh ke chale?
“Muh ke chale” usually means mouth ulcers: small, open sores in the soft lining of the mouth. They may appear inside the lips or cheeks, under the tongue, or elsewhere in the mouth. Eating, drinking, and speaking can become uncomfortable.
A common small ulcer looks round or oval, with a pale centre and a red border. The pale centre does not automatically mean there is pus or an infection. Appearance alone cannot confirm the cause.
One common type is an aphthous ulcer, also called a canker sore. These ulcers may return from time to time and are not contagious. However, not every mouth sore is an aphthous ulcer, and some infections or other conditions can look similar.
- A small ulcer may hurt more than its size suggests.
- An injury-related ulcer may sit beside a sharp tooth or a rubbing denture.
- A white patch, red patch, or lump is not necessarily an ulcer and may need a different assessment.
When does a mouth ulcer need an in-person examination?
An ulcer that has not healed within two weeks needs an in-person examination by a dentist or oral medicine specialist. An oral medicine specialist assesses problems of the mouth lining and related conditions. Do not keep waiting because the ulcer has become less painful.
Most short-lived mouth ulcers are not cancer. Still, a persistent ulcer can sometimes be a sign of a serious condition, including oral cancer. Pain, age, or the absence of tobacco use cannot reliably rule this out.
The two-week point is not a reason to delay care when warning signs appear earlier. Seek urgent care if you cannot swallow liquids, have difficulty breathing, or develop rapidly increasing mouth or neck swelling.
- An ulcer lasting beyond two weeks or repeatedly appearing in exactly the same place.
- A lump in the mouth or neck, or a firm area around an ulcer.
- New numbness in the tongue, lip, chin, or another part of the mouth.
- Unexplained bleeding or an ulcer that keeps bleeding.
- Difficulty opening the mouth or swallowing.
- A persistent red or white patch, unexplained weight loss, or worsening pain.
- Fever, many ulcers, or pain that prevents adequate drinking.
Why do mouth ulcers happen?
Mouth ulcers have several possible causes. An accidental cheek bite, a sharp tooth edge, braces, or an ill-fitting denture can damage the lining. Very hot food can also cause an injury that leaves a sore area.
Recurring aphthous ulcers do not always have one clear cause. Stress, poor sleep, and small injuries may be associated with episodes in some people. A food that stings an existing ulcer is not necessarily the food that caused it.
Sometimes ulcers are linked to nutrient deficiencies, infections, or conditions affecting the body's defence system. Certain ongoing treatments can also contribute. Tell the clinician about your health conditions and current treatment rather than making changes yourself.
People often describe ulcers as “body heat” or blame an upset stomach. These explanations do not identify the actual cause. Repeated, severe, or unusual ulcers deserve an assessment rather than an assumption.
- Local injury: biting, rough teeth, braces, or dentures.
- Recurring aphthous ulcers with no single obvious cause.
- A nutritional problem or an underlying health condition.
- An infection or another disorder of the mouth lining.
What can make eating and mouth care more comfortable?
Simple care can reduce irritation while a small ulcer heals. It does not replace an examination for a persistent or unusual sore. The aim is to keep the mouth clean and help the person continue eating and drinking.
Choose foods that feel comfortable rather than following a strict “ulcer diet”. Soft rice, khichdi, porridge, or other mild foods may be easier to eat. Let hot food cool, and avoid anything that clearly increases pain.
If a tooth, brace, or denture keeps rubbing the sore, arrange a dental visit. Repeated friction can delay healing. Do not file a tooth or attempt to reshape a dental appliance at home.
- Choose soft, mild food and take small bites.
- Drink enough water; cooler or room-temperature drinks may feel easier.
- Avoid spicy, sour, very hot, sharp, or crunchy food if it irritates the ulcer.
- Brush gently with a soft toothbrush without scrubbing the sore.
- Avoid tobacco, gutkha, and areca nut or supari, including products without tobacco.
- Do not repeatedly touch, bite, or scrape the ulcer.
Which home remedies and habits can make ulcers worse?
A painful ulcer can make quick-cure claims tempting. However, putting concentrated substances or harsh household products directly on the sore can burn the mouth lining. More burning does not mean a remedy is working.
An ulcer is not a pimple. Trying to burst it, peel away its pale surface, or scrape it clean can cause further injury and bleeding. Keep care gentle instead.
Do not use someone else's prescribed treatment or repeatedly use an unassessed mouth product to hide the pain. Different causes need different care, and temporary relief does not prove that an ulcer is harmless.
There is no reliable overnight cure for every mouth ulcer. If a sore is enlarging, recurring, or not healing, finding the cause matters more than trying another home remedy.
- Avoid burning, cauterising, cutting, or scraping a mouth sore at home.
- Avoid applying powders or mixtures of unknown contents.
- Do not assume that a natural product is safe for damaged mouth tissue.
- Do not postpone an examination because pain has temporarily reduced.
What happens during a dental examination?
The clinician will ask when the ulcer began, whether it has happened before, and whether the same spot keeps getting affected. They may ask about accidental biting, dental appliances, tobacco or supari use, eating difficulties, and other symptoms.
The examination usually includes the ulcer, the rest of the mouth, nearby teeth, and any appliances. The clinician may gently feel the area and check the neck for lumps. A photograph can help record changes, but it cannot show everything that an examination can.
Not every small ulcer needs tests. Depending on the findings, blood tests may help look for a nutritional or other health problem. A persistent or suspicious ulcer may need a biopsy, which means taking a small tissue sample for laboratory examination.
A biopsy recommendation does not mean cancer has been diagnosed. It helps establish what the tissue change is so that care can be planned appropriately.
- Bring a list of your current treatments and relevant health conditions.
- Note when the sore started and whether it has changed.
- Mention fever, bowel symptoms, skin changes, eye symptoms, or sores elsewhere.
What does treatment usually involve?
Treatment depends on the cause, not simply on how painful the ulcer feels. A small, typical aphthous ulcer may need supportive care and clinician-selected symptom relief. Larger, frequent, or unusual ulcers may need further assessment.
When friction is the cause, care may involve smoothing a sharp tooth edge or adjusting a denture or brace. Removing the source of injury helps healing, but the area still needs review if it does not settle.
If tests identify a nutritional problem or another illness, care focuses on that problem as well as the mouth symptoms. Some people need coordinated care between a dentist and a physician or another specialist.
A suspicious ulcer may require a biopsy or referral before treatment is decided. There is no single treatment that safely covers every mouth ulcer, and a short period of pain relief should not replace follow-up.
- Reduce irritation and support comfortable eating and drinking.
- Address a dental source of repeated injury.
- Treat an identified underlying condition.
- Arrange follow-up, testing, or specialist referral when needed.
What if mouth ulcers keep coming back?
Repeated ulcers are common, but frequent episodes should not simply be accepted as normal. Arrange an examination if new ulcers appear before old ones heal, eating is regularly affected, or episodes are becoming larger or more painful.
A simple symptom record can help. Note where sores appear, how long they last, and whether there was recent biting, stress, poor sleep, or a change in health. Photos taken on different dates can also help explain the pattern.
Ulcers with ongoing diarrhoea, weight loss, unusual tiredness, skin changes, or sores elsewhere may need a wider medical assessment. Eye redness or pain, especially with blurred vision, needs prompt medical attention.
Avoid cutting out many foods without a clear reason. An unnecessarily restricted diet can make nutrition harder. Any suspected food link or deficiency can be discussed during the assessment.
- Check for repeated rubbing from a tooth or dental appliance.
- Maintain gentle oral hygiene and a varied diet.
- Seek review if the pattern changes or other symptoms develop.
- Do not assume every new sore has the same cause as earlier ulcers.
Where can families seek care in Mumbai and Ambarnath?
A dentist can assess a new mouth ulcer and look for injury from teeth or dental appliances. An oral medicine specialist can help with persistent, recurrent, unexplained, or unusual sores. Urgent symptoms should be assessed at the nearest suitable healthcare facility.
Dr. Bipin R. Upadhyay practises at the Special Dental OPD, K.J. Somaiya Super Speciality Hospital, Sion, Mumbai, and at Reasonable Smile Dental Clinic, Ambarnath. His qualifications include an MDS in Oral Medicine and Radiology.
Families travelling from Thane, Badlapur, or Ulhasnagar can contact the clinic to confirm current appointment arrangements. Do not delay urgent care while waiting for a particular appointment.
An online consultation may help explain symptoms and guide the next step. It cannot replace an in-person examination when an ulcer persists or warning signs are present, because checking tissue firmness and examining the whole mouth require direct assessment.
- Arrange an in-person examination for an ulcer lasting beyond two weeks.
- Seek earlier assessment for a lump, numbness, unexplained bleeding, or difficulty opening the mouth or swallowing.
- Seek urgent care for breathing difficulty, inability to swallow liquids, or rapidly increasing swelling.
Questions people ask
Can a mouth ulcer heal in one day?
There is no reliable one-day cure. Most small ulcers heal within one to two weeks. Reducing irritation can make eating easier, but an ulcer that persists beyond two weeks needs an examination.
Can I eat spicy food if I have muh ke chale?
Spicy food often stings an open ulcer. Mild, soft food may be more comfortable until it heals. Also avoid sour, very hot, or crunchy foods if they hurt. You do not need to exclude foods that cause no discomfort.
Are mouth ulcers caused by body heat?
“Body heat” is a common explanation, but it is not a medical diagnosis. Ulcers may follow injury or occur repeatedly without a clear cause. Some are linked to nutritional problems or other health conditions.
Can mouth ulcers spread through sharing food?
Common aphthous ulcers are not contagious. However, some infections can cause sores that look similar. If sores occur with fever, blisters, or illness in other family members, seek an assessment rather than assuming they are ordinary ulcers.
Does a mouth ulcer mean I have cancer?
Most short-lived ulcers are not cancer. A persistent ulcer, lump, numbness, unexplained bleeding, or difficulty opening the mouth or swallowing needs an in-person examination. An ulcer can need assessment even if it does not hurt.
What should I do if my child has mouth ulcers?
Offer comfortable, soft foods and fluids, and arrange assessment if ulcers are severe or recurring. Seek urgent care if the child cannot drink, passes much less urine, or becomes unusually sleepy. Fever with several sores also warrants review.
Do I need blood tests for every mouth ulcer?
No. A small, typical ulcer that heals normally may not need tests. A clinician may suggest tests when ulcers recur often, are unusually severe, or occur with symptoms suggesting a nutritional problem or another illness.
Should I see a dentist if the ulcer is painless?
Yes, if it lasts beyond two weeks or has other warning signs. Pain is not a reliable measure of seriousness. A painless ulcer with a lump, numbness, or unexplained bleeding needs prompt in-person assessment.
This page is general information, not a diagnosis. A mouth problem needs to be looked at in person or on video before anyone can tell you what it is.