Mouth Ulcers and Canker Sores: Causes, Differences, and Home Care

Usha Dental Clinic · Sector 15, Gurugram · Updated 2026-09-19

If you have ever bitten the inside of your cheek or woken up with a small, painful sore on your gum or tongue, you already know how much a mouth ulcer can affect eating and talking. Many patients visiting our clinic in Sector 15, Gurugram ask whether their sore is a simple ulcer or something that needs closer attention. This guide explains what usually causes these sores, how to tell them apart from other oral conditions, and what actually helps them heal faster.

What Causes Mouth Ulcers and Canker Sores

Canker sores, also called aphthous ulcers, are small round or oval sores with a white or yellow centre and a red border. They are not caused by an infection and are not contagious. Common triggers include:

• Accidental biting of the cheek, lip, or tongue
• Rough edges on a tooth, filling, or braces wire rubbing against soft tissue
• Acidic or spicy foods, citrus fruits, and nuts
• Stress, tiredness, or hormonal changes
• Nutritional gaps, particularly low vitamin B12, iron, or folate
• Toothpaste containing sodium lauryl sulfate in sensitive individuals

Most people get a canker sore once in a while, but some experience them frequently. Recurrent ulcers are still usually harmless, though they are worth mentioning at your next dental visit.

How to Tell Mouth Ulcers Apart From Other Oral Issues

Mouth ulcers are often confused with cold sores, oral thrush, or other conditions. Knowing the difference helps you choose the right care.

Canker sores versus cold sores

Canker sores form inside the mouth, on the cheeks, tongue, or inner lips, and are not contagious. Cold sores, caused by the herpes simplex virus, usually appear on or around the outer lips, often start as a cluster of small blisters, and are contagious, especially when fluid is present.

Canker sores versus oral thrush

Oral thrush appears as creamy white patches that can be wiped away, often leaving a red, sometimes bleeding surface underneath. It tends to spread across the tongue or inner cheeks rather than forming a single defined sore, and is common in people using inhaled steroids, antibiotics, or those with a weakened immune system.

When a sore needs more careful attention

Occasionally a sore that does not heal, keeps growing, bleeds without an obvious reason, or feels hard or thickened may need further examination. This does not always mean something serious, but it should never be ignored.

Home Remedies That Actually Help

Most simple canker sores can be managed comfortably at home while they heal.

• Rinse gently with warm salt water two to three times a day
• Use an alcohol-free antiseptic mouth rinse to keep the area clean
• Apply a small amount of over-the-counter oral gel meant for ulcers to ease pain
• Avoid spicy, acidic, or very hot food and drinks while the sore heals
• Switch temporarily to a soft-bristled toothbrush around the sore area
• Stay hydrated and eat a balanced diet with enough iron and B vitamins

Cold compresses or sucking on ice chips can also numb the area briefly and reduce discomfort during meals.

When to See a Dentist

Please schedule a visit to Usha Dental Clinic in Sector 15, Gurugram if you notice any of the following:

• A sore that has not healed within two to three weeks
• Ulcers that keep recurring frequently
• Unusually large or unusually painful sores
• A sore accompanied by fever or swollen glands
• Any sore, lump, or patch that feels hard, thickened, or does not go away
• A rough tooth edge, ill-fitting denture, or braces wire that keeps causing repeated ulcers

A dentist can check for an underlying cause, smooth down a sharp tooth edge or appliance, and rule out other conditions. A routine consultation for a persistent mouth ulcer at our Sector 15 clinic typically falls in a modest range, and your dentist will always explain any recommended treatment and its cost before proceeding.

Treatment costs mentioned on this page are indicative ranges for the Sector 15, Gurugram region. Your exact cost depends on your case and will be confirmed after a clinical examination at the clinic.