When Should a Mouth Sore Be Evaluated?

Most mouth sores heal on their own within one to two weeks. However, some sores persist, recur frequently, or develop unusual features that should be evaluated by a dentist. Knowing when to seek care can help identify problems early and ensure you receive the appropriate treatment.

Are Most Mouth Sores Serious?

No.

Many mouth sores are caused by common conditions such as:

• Canker sores
• Minor injuries from biting your cheek
• Irritation from braces or dentures
• Burns from hot foods

These types of sores often improve without treatment within one to two weeks.

When Should You See a Dentist?

You should schedule an examination if a mouth sore:

• Lasts longer than two weeks
• Continues to grow
• Bleeds easily
• Returns frequently
• Causes significant pain
• Makes it difficult to eat or drink
• Is accompanied by swelling or other concerning symptoms

These signs don’t necessarily mean something serious is present, but they should be evaluated.

What If the Sore Doesn’t Hurt?

Pain isn’t always a reliable indicator.

Some conditions that require further evaluation cause very little discomfort—or none at all.

A painless sore that doesn’t heal deserves the same attention as one that is painful.

Could It Be a Canker Sore?

Possibly.

Canker sores are one of the most common causes of mouth sores.

They typically:

• Develop inside the mouth
• Have a white or yellow center with a red border
• Heal within one to two weeks
• Are not contagious

If a sore behaves differently than a typical canker sore, it should be examined.

Could It Be Something Else?

Yes.

Not every mouth sore is a canker sore.

Other possible causes include:

• Oral thrush
• Viral infections
• Trauma
• Irritation from dental appliances
• Inflammatory conditions
• White patches or other oral lesions

A professional examination helps determine the underlying cause.

What Happens During an Evaluation?

Your dentist will examine:

• The size of the sore
• Its location
• How long it has been present
• Whether it has changed over time
• Any nearby teeth or dental restorations that may be causing irritation

We’ll also review your symptoms and medical history to help determine the most likely cause.

Will I Need a Biopsy?

Usually not.

Most mouth sores can be diagnosed based on their appearance and history.

However, if a sore has unusual characteristics or doesn’t heal as expected, additional testing or referral to a specialist may be recommended.

This helps ensure an accurate diagnosis.

Can Mouth Sores Be Prevented?

Not all mouth sores can be prevented, but you may reduce your risk by:

• Maintaining good oral hygiene
• Avoiding tobacco products
• Wearing properly fitting dentures
• Correcting rough or broken teeth
• Avoiding foods that trigger recurrent canker sores

If you experience frequent mouth sores, your dentist may recommend additional evaluation to identify contributing factors.

Our Total Oral Health Approach

At Total Dentistry, we believe persistent changes inside the mouth should never be ignored.

While most mouth sores are harmless, careful evaluation allows us to distinguish common conditions from those that require additional attention.

Our goal is to identify the cause, recommend appropriate treatment when needed, and monitor any areas that don’t heal normally.

The Bottom Line

Most mouth sores heal within one to two weeks and aren’t a cause for concern.

However, a sore that persists, changes, or repeatedly returns should be evaluated by a dentist.

If you have a mouth sore that isn’t healing or you’re unsure what caused it, contact Total Dentistry to schedule an examination. We’ll determine the cause and recommend the most appropriate treatment for your oral health.