Hi Sagar, Dont worry. Your treatment is going in the right manner. Pulp is the only vital structure of the tooth which is rich in nerve supply, so when it is removed it causes pain. It is advised to take painkiller twice daily for 3 days during the treatment. Initial days of the treatment are crucial because the vital structure is removed so it is definitely going to cause pain but once the canals are filled with the medicine, the pain subsides. There is no connection between your tooth pain and chest pain. If your tooth pain is very severe, I would advise you to take painkiller as and when required. The pain will reduce in 1-2 days. Best wishes for speedy recovery. Regards, Dr. Dhwani Mishra.