Teeth just suck. Unless you are incredibly lucky with the good genes you just don't get decent use out of them compared to the current average lifespan, and they'll simply crap out on you. I really wish humans got teeth changes every twenty years or so instead of just once as a kid. I mean, yes, teething may hurt a bit, but not more than the mess of cavities, infected roots and inflamed gums that average adult human teeth end up with. *hugs*