well went to oral surgeon today to remove bad root canal , the good news was that they didn't use amalgam to seal root tip (yaaaaaaah) ,but the bad news was that when my old dentist had done the root canal ,he drilled 1/2 inch or about 10 milimeters past the base of the root into the sinus cavity ,the good news is that he said that he expects a 100% recovery with no complications ( guess what tooth it was ) good ol #13