Why is my canker sore lasting so long? its small but so painful. it hurts to talk. on side of tongue. im fearing cancer. i cant sleep

Be patient: Canker sore are the most common oral lesions. Individual ulcers typically last 1-2 weeks. The condition is idiopathic (cause is not known) recurrent aphthous ulcers is usually self-limiting. Try to keep adequate oral hygiene as possible. If concerned see your dentist after 10 days or visit today for laser immediate amelioration.

Symptomatic treatmen: Although self limiting, its very symptomatic. Anesthetic swishes can help symptomatically. Also Kenalog-Orabase a steroid based compound can provide relief by reducing inflammation. Although, these will need to be prescribed by your treating physician.