Could well be the cause. It pleases me in some unbeknownst way to see you've been able to relate to this info from Peggyaus, hearing it first hand. It is not uncommon for dramatic recoveries to occur in ill persons immediately following removal of root-cannalled teeth, definitely worth considering, although no DDS who actively installs them can ever admit to the truth on this for insurance and ethical reasons. Were they safe, I would have not refused offers of DDS's to install same in my own choppers. It takes severe bravery to have them removed.