Let me add this... root canals will grey your hair and age you rapidly. Ask me how I know? The first two root canals I ever had in my life...in about six months I had more gray hair than you could count. And I had 49 years of life behind me with little or no gray hair....six months of two root canals..add it up.

Thanks for the replies! Too bad it doesn't help with gray, but helping with hair growth us something I could use too. Im just starting to lose hair actually but figured it was genetic since it is male pattern baldness.