Vin,
my cancer was in my jaw, however the numbness issue is a real hassle at times.

I am numb (as in novaaine numb) all along my lower left jaw inside and out. I have no sensation in my mouth at all on that side, and about 30% of my tongue is numb as well.

It's problematic in that I have to be very careful of the temperature of food; I've burnt the inside of my mouth with hot cheese from a slice of pizza, and didn't realize it until some time later.

It's normal, and I'm told it will improve to some degree, although it may not return to pre-surgery norms.
Wayne