Symptom Breakdown
What you feel
A small, shallow, extremely painful sore inside your mouth—usually on the inner lips, inner cheeks, or under the tongue. It typically has a white or yellowish center surrounded by a bright red, inflamed border. Eating acidic, spicy, or salty foods causes an intense, stinging burn.
Why it happens
Unlike cold sores, canker sores (aphthous ulcers) are not contagious and are not caused by the herpes virus. They are triggered by a hyperactive immune response. Common triggers include localized physical trauma (accidentally biting your cheek, sharp braces rubbing), severe emotional stress, hormonal shifts, nutritional deficiencies (Vitamin B12, Iron, Zinc), or consuming highly acidic foods like citrus fruits.
Clinical Advice
- Avoid spicy, salty, or acidic foods while the ulcer is active. These will chemically burn the exposed raw tissue and severely delay the healing process.
- Switch to a toothpaste that is free of Sodium Lauryl Sulfate (SLS), as this common foaming agent is known to trigger severe canker sore outbreaks in prone individuals.
- Any ulcer that does not heal completely within 14 days must be biopsied to rule out oral cancer.
Treatment Note
Prescription topical corticosteroids, mucosal protective bandages, and Low-Level Laser Therapy (LLLT) to instantly seal nerve endings and accelerate tissue regeneration.