Mouth Ulcers: When They're Harmless and When They Could Be a Warning Sign

Almost everyone experiences a mouth ulcer at some point.

They can make eating, drinking, and even talking uncomfortable.

Fortunately, most mouth ulcers heal on their own.

But occasionally, they may signal something more serious.

Here's everything you need to know.

What Is a Mouth Ulcer?

A mouth ulcer is a small sore that develops inside the mouth.

It commonly appears on:

• Inside of the cheeks

• Lips

• Tongue

• Floor of the mouth

• Gums

Most ulcers are white, yellow, or grey with a red border.

Common Causes of Mouth Ulcers

1. Accidental Biting

One of the most common causes.

Accidentally biting your cheek or tongue can damage the soft tissues and trigger an ulcer.

2. Braces or Sharp Teeth

Broken fillings, rough teeth or orthodontic braces may repeatedly rub against the inside of the mouth.

3. Stress

Many people notice mouth ulcers during stressful periods.

Although the exact reason isn't fully understood, stress is considered a common trigger.

4. Nutritional Deficiencies

Low levels of:

• Vitamin B12

• Iron

• Folate

may contribute to recurring ulcers in some individuals.

5. Certain Foods

Highly acidic or spicy foods may irritate the mouth and worsen existing ulcers.

Examples include:

• Pineapple

• Citrus fruits

• Chillies

6. Hormonal Changes

Some people experience ulcers during hormonal fluctuations.

7. Viral or Other Medical Conditions

Occasionally, ulcers may be associated with viral infections or other underlying health conditions.

Persistent or unusual ulcers should always be evaluated.

Are Mouth Ulcers Contagious?

Most common mouth ulcers are not contagious.

You cannot spread them through kissing or sharing utensils.

However, ulcers caused by certain viral infections may behave differently.

How Can You Treat Mouth Ulcers?

Most heal naturally within 7 to 14 days.

Meanwhile, you can:

• Maintain good oral hygiene.

• Use a soft toothbrush.

• Avoid spicy foods if they worsen discomfort.

• Stay hydrated.

• Use dentist-recommended protective gels or mouth rinses when appropriate.

Avoid repeatedly touching the ulcer with your tongue.

When Should You See a Dentist?

You should seek professional advice if:

• The ulcer lasts longer than two weeks.

• It keeps returning.

• It's unusually large.

• It causes severe pain.

• You notice difficulty swallowing.

• You develop multiple ulcers at once.

• The ulcer doesn't appear to be healing.

Persistent ulcers deserve proper examination to identify the underlying cause.

Can Mouth Ulcers Be Prevented?

While not all ulcers are preventable, you can reduce your risk by:

• Maintaining good oral hygiene.

• Eating a balanced diet.

• Managing stress.

• Fixing sharp or broken teeth.

• Visiting your dentist regularly.

Common Myths About Mouth Ulcers

Myth: Mouth ulcers are always caused by spicy food.

Fact: Spicy foods may irritate an ulcer, but they're rarely the original cause.

Myth: You should stop brushing near an ulcer.

Fact: Continue brushing gently to keep your mouth clean and reduce bacterial buildup.

Myth: Every mouth ulcer is harmless.

Fact: Most are harmless, but any ulcer lasting more than two weeks should be professionally examined.

Final Thoughts

Most mouth ulcers are minor and heal naturally within a couple of weeks.

However, ulcers that persist, recur frequently or become unusually painful should never be ignored.

At Atom Dental, we can identify the cause of your mouth ulcers, recommend appropriate treatment, and ensure there isn't a more serious underlying condition.

A healthy mouth isn't just about your teeth—it's about every part of your oral health.