Yeppers.... grey hair is inevitable for all but a few folks, for whom no hair is the option. I scope mine out periodically... I occasionally have a few greys show up, but it seems to be related to my stress level -- more stress, more runaways.
As for the teeth, I ran across that a few months ago. They're using (dum-dum-DUUUMMMM!!!) stem cell technology to do it... they take embryonic stem cells that have not been "programmed" to be any particular kind of cell yet, place 'em in the spot where a tooth should be, and a tooth then grows. They've had successful tests on mice so far... and knowing that the average person loses eight of their teeth in their lifetime (and me with four wisdom teeth removed, two root-canalled, and three crowned), the possibility of real replacement teeth is very intriguing.
And according to the guy who did my last root canal, the tooth is not completely dead. There are no nerves left on the inside, but there are nerves on the outside around the base, and they can still cause you grief...
*edit* typos...
[ 11-10-2005, 09:19 AM: Message edited by: Bungleau ]