Conversation: The conversation between human and AI assistant.
[|Human|] I had a root canal 3 times in 2011 so far.  After each procedure, 7-10 days later, my left leg would swell up to twice its normal size with great pain in my left thigh, then it got better after 3 weeks. 3 root canals, 3 swollen leg episodes. What dental chemicals might have caused this and better, how do I fix the swelling? Thanks
[|AI|]  Hello, thank you for consulting with Chat Doctor. Actually before a root canal treatment an injection of local anesthesia is given to make the tootChatDoctorfortable for the treatment. In some cases people can be allergic to the preservative used in anesthesia. So it will be better that once you should get tested for the allergy of anesthesia. After that go for the treatment. Hope it will help you.