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This is Dr. David
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how old are you?
there are conditions which can cause numbness of the roof of your mouth.
the trigeminal nerve in the brain is the large nerve which collects information from the face and mouth and brings it to the brain.
the roof of the mouth is most often the least sensitive part of the mouth
and so, it could be normal for you not to feel certain sensation there.
do you have high anxiety symptoms? this can make you more worried and alarmed about small changes in your body
also anxiety can increase blood pressure as well.