The class III experience

It was a very good learning experience with my class three. Her calculus was so hard it was like cement. I used my universal ultra sonic on almost full blast coming at it from every direction, even doing the jackhammer with the tip on it and it was not budging! Instructor Hafen said that she had never seen that tenatious of calculus in her 25 yrs of Hygiene. I just hope that I don't get that tenatious of calculus with my board pt.