Root canal tooth re-infected a couple of times – saveable or implant likely?

Hi, I’m looking for general guidance before making a decision with my dentist.

I’m 43. The highlighted tooth in the X-ray has had a root canal and crown/post previously. It has become infected a couple of times over the last year or so. I’ve taken antibiotics which cleared it up each time, and there’s currently no swelling or pain.

I understand no one can diagnose from an X-ray alone, but I’d really appreciate some general opinions on typical treatment paths for something like this.

Questions:

1. For a previously root-treated tooth that keeps getting infected, is it often still saveable (e.g. re-root canal or apicoectomy), or does this pattern usually point toward extraction?
2. What signs on an X-ray would suggest the tooth is not worth saving (e.g. root fracture, bone loss, failed post, etc.)?
3. If extraction is needed, would an implant normally be the preferred option here, or would a bridge be just as reasonable?
4. Based on the location (upper premolar area), how common is needing a bone graft or sinus lift for an implant?
5. For the UK, what would be a realistic private cost range for:
   • extraction
   • implant + crown
   • and possible bone graft (if needed)

I’m trying to understand whether I should push for a specialist opinion (endodontist) before agreeing to extraction.

Thanks in advance.

https://preview.redd.it/rwhripbh57xg1.png?width=1080&format=png&auto=webp&s=674302f819cc2fe73f9d814e45dcd56ee6544bfd