Should I have the root canal or the extraction?

I recently cracked part of a filling off of my back left molar during chewing. The dentist could not see any cracks on the xray. The tooth is mostly old filling. I was hoping to just leave it alone, but this week I have bitten down on food with i! t twice and had excrutiating pain that lasted a couple of minutes. I have been experiencing headaches as well this […]