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Infection underneath my crown?

I had a crown fitted several years ago on my lower left molar 2nd to last, I have no wisdom teeth, and now, several years later, I experience moments of pain and discomfort lasting a week to 3 weeks. I am begining to think the tooth under my crown has become infected as even the tooth where the crown meets is beginning to turn black. I also get a bubble of pus on my gums under the crowned tooth that fills and fills until it bursts on its own. These sympoms go away for a long period of time then they return. I can handle the discomfort but it's quite annoying. I wonder if it's time to see the dentist or just let my body try to fight this on its own...any and all advice is greatly appreciated.
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Avatar universal
you need to see a dentist. an abscess will keep coming back without treatment. also it is possible for the infection to spread to the bone which is pretty serious. pus bubbles are not something to ignore!
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