When I was 12 years old, one of my back teeth teeth got rotten. I was taken to the dentist & he gave me a filling. It was okay until I was 21 years old. The tooth rotted again & I didn't notice. When I was chewing chicken bone the tooth broke into pieces. About 50% of it broke. The center pieces of the tooth broke. I was taken into doctor again & he placed a huge chunk of filling in the tooth. The dentist told me to avoid eating on that side & advised to get a cap for the tooth later. However, I never got that cap & now part of that tooth is rotting & breaking into pieces again. A part of the filling also got rotten. Now what should I do? I'm scared of a root canal as I heard it hurts a lot. Will just a cap will do the job? BTW, I feel no pain at all in that teeth. Aside from when some parts of the tooth broke I felt excruciating pain but now its nothing.