well, i don't know where you are getting your information, but you just pretty-much described a root canal. we don't don't do root canals. we clean out cavitations that are caused from root canals. cavitations take about 20 minutes to clean or less, depending how much dead jaw bone there is to clean out. the oxygen and nutrients from your blood feed the bone and cause it to fill in. nothing should be put in there. it costs up to $150 in Tijuana. price ranges in the states are from $440. to $2500. per cavitation.