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Obvious question is:
Have you had your wisdom teeth removed?
If not, it could by your wisdom teeth growing in... possibly impacted (lodged at an angle against your molar) or growing out at a really weird angle.
If that's the case, it will grow against your molar and possibly push your teeth out of line. You may also need a root canal if it kills the root.
If there's no pain, it may not be an infection. I'd go get it looked at.
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