Re-treatment or Extraction or Implant or partial denture? (Photo)

My doctor said tooth extraction is the only way for me, she said i have done root canal treatment before, when i have it crowned 8 years ago. so it useless to do root canal treatment again. Can it still be saved? If tooth extraction is the only way. Can I leave it just as that without replace my missing teeth? Can I do tooth implant 10 years after the extraction? What is the best removable partial denture? Can i worn it all day long even when i sleep? I plan to take it out only when i wash it.

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