After a while, when using an ultrasonic scaler, my mind drifts off. Sometimes I even wonder what I am doing, and why? In March 2016 Mrs Collins isolated premolar supporting her CoCr -/p was M2 and bleeding. Desperate measures were required, so I sent her a YouTube video form the excellent group Perio Courses. In July 2020 she still has no bleeding, no mobility, and a lower denture she likes-even more unusual. She was the tipping point for my teeth4life APP.