<s>[INST] Hi...my 6 year old child had dental surgery two weeks ago. He had a root canal on one of his upper back left teeth because of a bad cavity. The dentis was unable to finish because the pain was too bad. The dentist said that he had administered as much numbing (by needle) as he could. He explained that he placed something inside of his tooth and then placed a white sealant over it. He said that if the pain continued then he would have to extract the tooth. My son was doing very well after the surgery, but about two days ago, the left upper side of his mouth has started to droop. He says that it is numb like when he had dental work. I was wondering if this could be caused from the dental surgery two weeks ago? [/INST] Hello,Thanks for writing to us.The pain may be due to the infected pulp remaining within the canals.I would suggest you to take amoxycillin along with analgesics.The infected pulp remaining within the canals has to be extirpated completely.If teeth cannot be saved,get it extracted.Maintain oral hygiene well.Gargle frequently with warm saline.Take care. </s>