Canker sores are small, painful ulcers that form inside the mouth and often make eating, brushing, or talking uncomfortable. Most canker sores heal on their own in 7 to 14 days, while larger or deeper sores may take several weeks and should be checked if they do not improve.
If a mouth sore is not healing as expected or keeps returning, a dental exam can help determine whether it is a canker sore or another oral condition. Smile Designers in San Diego, CA helps patients understand persistent mouth changes through thorough dental exams and personalized guidance.
A canker sore, also called an aphthous ulcer, is a shallow break in the soft tissue inside the mouth. It often has a white, yellow, or gray center with a red border.
These sores usually appear on the inner lips or cheeks, under the tongue, on the gums, or along the soft palate. They can sting or burn and may make normal daily functions feel irritating.
Unlike cold sores, canker sores occur inside the mouth, are not caused by the herpes virus, and are not contagious. That distinction matters because treatment and follow-up needs are different.
Most minor canker sores improve within a few days and heal fully in one to two weeks. Pain is often worse early on and then eases as the tissue closes.
Major canker sores are less common but larger, deeper, and more painful. They may last several weeks and can sometimes leave a scar.
A sore that remains present for more than two weeks should be professionally evaluated. Persistent ulcers are not always simple canker sores.
Healing can take longer when the area keeps getting irritated. Common triggers include a sharp tooth edge, braces, dentures, cheek biting, or rough, spicy, or acidic foods.
Stress, minor mouth injuries, nutritional deficiencies, certain medications, and some health conditions may also act as predisposing factors for recurrent or slow-healing sores. When sores keep returning, the cause is worth a closer look.
Not every mouth ulcer is a canker sore. Infections, immune-related conditions, ongoing trauma, and, less commonly, oral cancer can look similar, which is why persistent or unusual sores need professional assessment.
Most minor sores can be managed with supportive care while they heal. Avoid spicy, acidic, salty, or sharp foods, brush gently with a soft-bristled toothbrush, and use mild salt-water rinses if they feel soothing.
Over-the-counter protective coatings and pain-relief products, including some local anesthetics, may help reduce discomfort. They should be used as directed and may not be appropriate for everyone.
A dentist may recommend prescription topical treatment for severe, frequent, or especially painful sores. An exam can also identify whether a rough tooth, appliance, or bite pattern is repeatedly irritating the tissue.
Treatment candidacy depends on the soreās size, location, duration, frequency, likely cause, and your medical history. Improving comfort also supports normal chewing, speech, oral hygiene, and the healthy appearance of the mouth.
Arrange an evaluation if a sore has not healed within two weeks, keeps coming back, is unusually large, or becomes more painful instead of less. You should also seek care if it occurs with fever, rash, swollen lymph nodes, diarrhea, or unexplained weight loss.
A dentist may examine the area, look for local irritation, review possible health factors, and recommend further medical follow-up when needed. This helps rule out other causes and guides the right treatment plan.
Seek prompt care for severe swelling, uncontrolled bleeding, rapidly worsening symptoms, or trouble swallowing or breathing. Those signs need faster attention.
If a canker sore lasts longer than expected, keeps returning, or becomes unusually painful, a dental exam can help identify the cause and determine whether treatment is needed. Contact Smile Designers in San Diego, CA, serving nearby areas, at (619) 222-6000 to schedule a dental exam and get clear guidance on your next steps.
Yes. A large or deep canker sore can last several weeks, but any mouth ulcer still present after two weeks should be evaluated to rule out infection, ongoing trauma, or another oral condition.
No. Canker sores are not contagious and cannot be spread through kissing, shared utensils, or other routine contact.
No. A canker sore is an ulcer, not a fluid-filled blister, so trying to pop or cut it can increase pain, bleeding, tissue injury, and healing time.
Recurrent sores may be linked to stress, tissue injury, irritating dental appliances, nutritional deficiencies, certain foods, medications, or underlying health conditions. A dentist or medical professional can help investigate frequent outbreaks, especially when they are severe or come with other symptoms.
