Lol. Everything is about vitamin b! You may be entirely right, I just find it a little humerous.
There is a huge network of nerves about the face and mouth..tongue included. If you're a tooth grinder, you could have pinched a nerve. You may have a little burn. There may be a blood vessel putting pressure on a nerve somewhere. Your doctor will know more...so why not make an appt?
However, I am truly concerned, because you mention a unilateral numbness, it makes me question:
Have you had back or shoulder pain? Pain or numbness radiating down one side of the body or another? Chest pain? Difficulty regulating body temperature? Forgetfulness?
The signs of stroke or aneurism are: sudden numbness, especially in the face, arm or leg, and most especially if it is on one side of the body. Additionally, severe headaches, difficulty speaking or walking even if mild, trouble seeing in one eye or even both, confusion, or trouble speaking or understanding what others are saying. Because "mini-stokes" can be very subtle, I really must urge you to contact your doctor as soon as possible. The odds of a far more devasting stroke happening after a mild occurance are too great to ignore. Better to work on the safe side. Too many people die or become debilitated needlessly because they fear embarassment, that they will be viewed as overreacting when they take action on these symptoms. Your doctor, if he's worth his salt, will not take this symptom lightly.
You don't mention your age or any other medical issues, but Stroke really doesn't discriminate. Don't think you're too young or too healthy. Go see your doc, and if you don't feel he/she is being attentive, get a second opinion. You are too valuable not to!