Mouth Ulcers: Causes and Treatment

What is a mouth ulcer?

A mouth ulcer is a small, painful sore inside the mouth, on the cheeks, lips, tongue or the soft palate. Ulcers usually look white or yellow in the centre with a red edge. They are common, and most people have one at some point in their lives.

If you are looking for a dentist in Multan because a sore will not settle, our routine checkup and cleaning is a good place to start. We can look at the sore, check the rest of your mouth, and explain what we see in plain language.

What causes mouth ulcers?

Ulcers often follow a small injury. Biting the inside of the cheek, a sharp tooth edge, a rough filling or a brace wire can all cause one. Stress and tiredness are also linked to ulcers for many people, and some ulcers appear around the time of illness.

Some people find that certain foods trigger ulcers, including very acidic or spicy foods, or foods they are sensitive to. Ulcers that keep coming back can sometimes be linked to a shortage of vitamins or minerals, such as iron, folate or vitamin B12, so a doctor may suggest a blood test if the pattern repeats.

Occasionally, ulcers are part of a longer-term condition. Your dentist or doctor can help work out whether that is likely in your case.

How long do mouth ulcers last?

A typical minor ulcer heals on its own within one to two weeks. Larger ulcers can take longer, and healing is slower if the ulcer is repeatedly irritated by food or by a sharp tooth.

The first few days are usually the most painful. Keeping the area clean and avoiding things that rub against the sore can make a real difference to comfort while it heals.

What helps a mouth ulcer heal?

Many people find relief from simple steps at home. Rinsing gently with warm salt water after meals can keep the area clean. Soft, cool foods are easier to eat than spicy or acidic ones. Brushing with a soft toothbrush and avoiding mouthwashes that contain alcohol can also help, because alcohol can sting.

Over-the-counter gels and rinses designed for mouth ulcers can ease pain for some people. Ask a pharmacist which product suits you, and follow the instructions on the packet. Children and pregnant women should check with a doctor before using any medicine.

Avoid picking at the ulcer, and try not to bite it. Keep your toothbrush clean and replace it regularly, especially after you have had an infection.

When should I see a dentist about a mouth ulcer?

Book an appointment if an ulcer lasts longer than about three weeks, is unusually large, or keeps coming back. Also see a dentist if the sore is hard to the touch, or if it bleeds without any reason.

Seek medical care quickly if you have a fever with mouth sores, cannot drink enough fluids, or notice swelling in the face or neck. These signs need prompt assessment, and you should not wait for a routine appointment.

A dentist will check for other causes too, such as a sharp tooth edge or a rough filling that needs smoothing. If you have a dental check-up booked, mention the ulcer so it can be checked during the visit.

Can mouth ulcers be prevented?

You cannot prevent every ulcer, but you can reduce the likelihood. Eat a balanced diet with plenty of fruit and vegetables, drink enough water, and manage stress where you can. If a sharp tooth or a dental appliance repeatedly rubs your cheek, ask your dentist to smooth it.

Good daily brushing and cleaning between the teeth keep the mouth in good condition, and regular check-ups help catch problems early. Good oral hygiene is one of the most useful habits for overall oral health, as described by the World Health Organization.

How is a mouth ulcer different from a cold sore?

People often confuse the two. A mouth ulcer is a sore inside the mouth, on soft tissue such as the cheek, tongue or lips inside the mouth, and it is not caused by a virus. A cold sore is a blister that usually forms on or around the outside of the lips, is caused by a virus, and can spread to others through close contact.

Cold sores usually start with tingling or burning before a small blister appears, and they often crust over. A typical ulcer has no blister and tends to look like a shallow crater with a white or yellow centre. If you are unsure which one you have, tell your dentist or doctor, because the treatments are different.

What happens at a dental check-up for mouth ulcers?

At your visit, we will look at the sore and the rest of your mouth. We ask how long the ulcer has lasted, whether it is getting bigger, and whether you have had similar ones before. We also check for sharp tooth edges, broken fillings or dentures that rub against the tissue.

If the ulcer does not follow the usual pattern, we may take a closer look or suggest that you see your doctor for blood tests or further checks. Our aim is to find out whether a simple irritation is the cause or whether something needs more attention. Your check-up also includes a cleaning, because good oral hygiene supports healing.

Which foods and habits can make ulcers worse?

Acidic foods such as citrus fruits and tomatoes, spicy dishes, salty snacks and very hot drinks can sting an existing ulcer and slow healing. Crunchy foods, such as crisps and toast, can also scratch the sore and make it more painful. Some people find that chewing gum or hard sweets triggers an ulcer on the cheek.

Smoking and heavy use of alcohol can irritate the lining of the mouth and make ulcers take longer to heal. If you notice that a particular food reliably brings on an ulcer, keep a simple note of what you eat and when the sores appear. This record can help you and your dentist work out a pattern.