That's something you don't really think about until you've had or need a trip to the dentist...or you did the worst thing you could possibly do to the inside of your mouth: bite part of it
. In a valiant effort to protect that area, people usually try chewing on the other side. Unfortunately, all that swelling makes biting the same area again almost impossible to escape.
I think I chew fairly evenly on both sides. If I spend overmuch time thinking about it the next time I chew on something, I'm sure to bite something other than the food.