This is a question that you don't need to take too seriously. I doesn't ask this question because I'm serious, but because I'm curious. I do often post serious threads at Susan's place, but not always. Would be fun to see what people would choose...
If you must choose between having TEETH AS HAIR or HAIR AS TEETH, what would you choose then?
Here you get a explaining.
TEETH AS HAIR= Your teeth in your mouth is normal and rest of your body is also normal, but except your hair. Instead of having hair, you haves teeth that grows out of your head. It's not more painful than it is normally when they grows in your mouth. They grows out only one time and are there permanent, except if you remove them. Removing is expensive. You hasn't any hair at your scalp, only teeth. But beard, eyebrow, pubic hair and eyelashes stays normal. It's recommended to brush your teeth inside your mouth and teeth on your head. If you don't brush your teeth-hair, it would be yellow and stinky. It may be a advantages to have teeth on your head, if you lose one of your teeth in your mouth. Then it would be teeth-replacement.
HAIR AS TEETH= Your hair at your scalp are normal. Rest of your bodies remains normal too except that you have hair growing in your mouth instead of teeth. You have to trim the hair. How you manage to eat is up to you... some finds their methods, other not.
So it's teeth in your mouth and teeth at your head VS hair at your head and hair in your mouth, you decide.