<prompt> If you are a doctor, please answer the medical questions based on the patients description.I had a root canal filling on Wednesday at my local dentist. He supplied me with an amoxicillin prescription for 3 250 mg daily which I started Thursday night as I had pain and swelling around the site of the filling inside. On Thursday I developed some cheek swelling that side which has slowly got worse despite the amoxicillin although now I do not have pain around the tooth but could not bite on it.  <response>: Hi heartlands for asking your queryHistory provided shows that root canal done has developed some infectionEither some canal is missed to be cleaned, or infected pulp is not completely expiratedget a X-ray done to evaluate the CTIF X-rays shows per apical infection then root canal treatment has to be repeatedMeanwhile maintain good oral hygiene salt water intestate your antibiotic and analgesic overconsume dentist for further evaluationThanks 