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Once bacteria set up house deep inside a tooth, they are sheltered from the immune system while dispatching bacteria into the blood system. I've had infected tooth removed and found myself feeling a whole bunch better after.

Infection can spread to adjacent teeth or sneak in alongside a loose filling or underneath a crown.

A wobbly tooth is likely infected and you might want to get it out to protect adjacent teeth.

I had a root canal in my 20s that failed 10 years later and was replaced by a bridge that had to be replaced every decade or so until a tooth supporting the bridge failed; so I ended up with two implants.

Implant technology is really good today. You will ultimately save money and misery by going straight to an implant if a root canal or bridge is suggested. You will still need to floss to prevent gum loss.