Ever had a painful sore inside your mouth?

That small, round, stinging spot on your lip or cheek is likely an aphthous ulcer, commonly called a canker sore. While they’re not dangerous, they can be very uncomfortable, especially when eating or speaking.

What is an Aphthous Ulcer?

An aphthous ulcer is a non-contagious, shallow ulcer that develops on the soft tissues inside your mouth. Unlike cold sores, they don’t occur on the lips’ outer surface and are not caused by viruses.

You might have an aphthous ulcer if you notice:

• A round or oval sore
• White or yellow center
• A red border (halo)
• Pain or burning sensation 
• Located on soft areas like:

• Inner lips
• Cheeks
• Tongue
• Floor of the mouth

Types of Canker Sores

Minor ulcers – Small, most common, heal in 1–2 weeks

Major ulcers – Larger, deeper, may scar and take longer to heal

Herpetiform ulcers – Multiple tiny sores that may merge

What Causes Them?

The exact cause isn’t always clear, but common triggers include:

• Stress or fatigue 
• Accidental cheek or tongue biting
• Brushing too hard
• Vitamin deficiencies (B12, iron, folate)
• Hormonal changes
• Certain foods like spicy, acidic

How to Treat Aphthous Ulcer 

Most aphthous ulcers heal on their own, but you can reduce discomfort with:

• Topical pain relievers like Benzocaine
• Antiseptic or saltwater rinses
• Topical corticosteroids (for severe cases)
• Avoiding spicy or acidic foods

How to Prevention 

• Use a soft-bristled toothbrush
• Maintain good oral hygiene
• Manage stress levels
• Eat a balanced diet rich in vitamins
• Stay hydrated

When Should You See a Dentist?

While canker sores are usually harmless, consult your dentist if:

• The ulcer lasts more than 2 weeks
• It’s unusually large or very painful
• You experience frequent recurrences
• There are signs that may suggest something more serious, like Oral Cancer

Aphthous ulcers may be small, but they can be quite bothersome. They’re usually temporary and manageable with simple care. Paying attention to triggers and maintaining good oral health can help reduce how often they appear.

Have a painful mouth sore?
Don’t ignore it, early advice can make a big difference.

Book a consultation today here at Clear Dental Clinic for proper diagnosis and relief!