I had a filling on one of my molars for about 4 years now. Lately I noticed a bad taste from the filled tooth. When I scratch or touch it, it smells really bad. There is a throbbing pain from the area when I eat or drink anything hot or cold.
Could this be an infection? Do I need a canal or is there any other way to save the tooth?
Please advice me on what to do. Thanks a lot.