Canker sores on the back gums—particularly around the molar area—are small yellowish-white lesions that appear on the inner gum tissue. Because the area is frequently compressed while chewing or touched by the tongue, this type of sore often feels more painful than sores that appear elsewhere.
Most cases are classified as recurrent aphthous stomatitis (RAS), which refers to canker sores that come and go. Although they are not contagious, the pain can be intense and disrupt eating, drinking, and even brushing teeth. Many patients report that canker sores on the gum near the molars cause sharp discomfort and make chewing difficult.
Causes of Canker Sores
Several factors can trigger canker sores in the molar area:
Mechanical Trauma
Accidentally biting the inner cheek or gum while eating
Brushing too aggressively
Sharp edges of molars or uneven dental fillings
Stress and Lack of Rest
Stress weakens the immune system, making canker sores easier to develop.
Nutritional Deficiencies
Low levels of vitamin B12, folate, iron, or vitamin C are often associated with recurring sores.
Hormonal Imbalance
Some individuals experience canker sores before their menstrual cycle.
Food Allergies or Sensitivities
Including spicy foods, acidic foods, certain nuts, or other irritants.
Systemic Diseases (less common)
Such as anemia, autoimmune conditions, or gastrointestinal disorders.
If a sore does not heal within 14 days, further examination is recommended.
Recommended Treatments
To treat canker sores on the back gums, the following methods are commonly advised:
Anti-inflammatory or Antiseptic Mouthwash
With a dentist’s recommendation, mouthwashes such as chlorhexidine, benzydamine, or povidone-iodine can help reduce inflammation and prevent secondary infection.
Topical Ointments or Gels
Triamcinolone acetonide
Hyaluronic acid gel
Benzocaine gel for pain relief
Use as directed by a healthcare professional.
Cold Compress
Applying ice pellets can help ease pain and reduce swelling.
Avoid Triggers
Limit spicy, acidic, or hard foods that may worsen irritation.
Maintain Good Oral Hygiene
Use a soft-bristled toothbrush and avoid brushing the sore area too aggressively.
Tips to Prevent Recurring Canker Sores
If you frequently experience canker sores on the gum near the molars, these preventive steps can help:
Consume foods rich in B-complex vitamins, iron, and vitamin C
Manage stress and get adequate sleep
Use SLS-free toothpaste if you are sensitive
Stay well-hydrated
Avoid repeated trauma from hard foods or overly aggressive brushing
The Importance of Nutrition and Oral Hygiene
Canker sores on the back gums often appear when immunity drops due to poor nutritional intake. Maintain a balanced diet with enough vegetables, fruits, and essential minerals.
Oral hygiene also plays a major role. Plaque buildup can worsen gum irritation and slow down healing. Brush twice daily and use dental floss to clean between teeth.
Conclusion
Canker sores on the back gum near the molars can develop due to trauma, nutritional deficiencies, stress, or certain food sensitivities. While generally not dangerous, their sensitive location can cause more intense pain. With the right care—from mouthwash and topical gels to proper oral hygiene—most sores heal within several days to two weeks.
If the sore recurs frequently, grows larger, or does not heal after two weeks, consult a dentist for further evaluation.
Reference
Miller, D. (2015). Recurrent aphthous stomatitis: Etiology, diagnosis, and treatment. Advances in Neonatal Care, 15(1), 76–82. https://nursing.ceconnection.com/ovidfiles/01412499-201501000-00002.pdf
Gasmi Benahmed, A., Noor, S., Menzel, A., & Gasmi, A. (2021). Oral Aphthous: Pathophysiology, Clinical Aspects and Medical Treatment. Archives of Razi Institute, 76(5), 1155–1163. https://doi.org/10.22092/ari.2021.356055.1767
