What causes a swollen frenulum?

A swollen frenulum can be caused by various factors, including irritation or injury from biting or trauma, infections, or inflammatory conditions. Allergic reactions to certain foods or dental products may also contribute to swelling. In some cases, it can be a sign of oral thrush or other infections. If the swelling persists or is accompanied by pain, it's advisable to consult a healthcare professional for proper evaluation and treatment.