tenacious calculus

Clinic was good. My exam for a Class III had some interesting spots of tenacious calculus. With it being a hit and miss with the tenacious calculus it makes me wonder if spots were missed and I was able to work on them today. One of the spots was green calculus so I knew immediately when I had that piece off. The others were not as noticable. It took a bit of work, more pressure of course and instructor observation while working the areas. I found it to be quite a valuable experience in the removal of it.