They are called phantom pains. Just like when some one has a limb missing and it feels like something is itchy or painful. They also are called phantom pains. Not really sure about the denture part this only a guess at it.

Also has never happened to me was hit in the face at work while unloading a truck and had to get a partial plate. I have never had these feelings of cavities though.Like I say could be phantom pains.

Website below may help some about limbs second one says about teeth.

Hope this is helpful.

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