Our teeth is made up of three layers which incudes enamel, dentine and pulp. Where Pulp is the inner most layer which includes the nerves and blood vessels. When a teeth is deeply decayed, cracked or fractured which mainly happens due to damage in the enamel layer of your teeth, then sign of problem in the pulp starts to appear. The symptoms of problem In layer of your teeth includes severe pain in your teeth, sensitivity in your teeth for a longer duration, discoloration of your teeth, swelling in your gums and bad taste in your mouth. These problems can be cured by the root canal treatment. This root canal treatment is very comfortable and painless as your teeth is anesthetized during the treatment. After the treatment is done you may feel sensitivity for some days which is very normal and can be cured by taking pain killers.