Your teeth being incredibly close to your brain, there is a chance that a bad abscess (when the tooth dies and the nerve becomes infected) can lead to serious injury and/or death.
It's a small chance, but better to get it taken care of now. Go to the dentist.
A good dentist should be able to locally anesthetize you with minimal discomfort.
Yes get it checked out and fixed. Could be an infection. Untreated infections (even in your teeth) are serious business. Could turn into sepsis which is a life threatening issue.
What mxpower76 said.
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*edit*
True story, Un1 - some years back while in the army, I had an abscess that spread into my sinus cavities. I lay in bed in agony for three days while waiting for the infection to go down, and the opiates I had wouldn't cut through the pressure and the pain. I wound up having to go to the emergency room for emergency treatment. In the end, I had to have surgery in order to drain it - wherein the oral surgeon cut into my gums ans scraped them away from the bone while I was under local anesthesia. Now
that was pain... white hot, blinding, searing pain. My hat off to the Colonel who performed the procedure - man looked like M. Bison, but had the best bedside manner I've ever experienced.
Trust me, compared to that, a shot of lidocaine in your gums and a little bit of drilling is nothing. And chances are, if the pain is intermittent, you have yet to reach the stage of abscess, and just need some drilling and filling. Go to the dentist.