yes i have two molars that had cracked roots, two different dentists wanted to root canal them back in 05 but I wouldn't let them. the teeth are fine now and I chew beef jerky with them. i did go thru a few rough spells of pain but endured it, although I think most others would have caved in and had them pulled or root canalled. they;'re slow to heal b/c there isn't a hell of a lot of blood flow there, but contrary to what dentists are taught , they can heal themselves. One needs a selective vasodilator and a material that's anabolic to bone growth in addition to the usual additives, and keeping out the usual poisons.