Dental Bridge Talk

I currently have a mandibular molar bridge on the right side. However, I now have a missing mandibular molar on the left side, and I'm considering the option of getting a bridge on the left side as well.

Following the extraction of two molars on the same side, I've noticed an uneven and sharp jaw bone ridge. I'd like to avoid jaw recontouring and am considering replacing only the front molar to prevent the discomfort caused by the denture rubbing against the pointed, sharp bone ridge where the back molar used to be. Is this a feasible and effective solution?

Hello, I've had a bridge in place for approximately 10 years. The tooth underneath it now requires a root canal procedure. Will I need to get a new bridge once the root canal is completed?