Practice does not make perfect!

So I cleaned this mans teeth. It was pretty much interpoximal and sub. So I used the cavitron aka ultrasonic. I know I was rushed to finish his cleaning in the time allowed but I felt that I did an alright job. That was 2 months ago. He came in yesterday and had to have a partial root canal tx. I was curious to see what that entailed since I have not been an assistant and am pretty clueless when it comes to dental work. So I pulled up his digital xrays and guess what was right under the contact of 30-31....yup calculus! I immediately pulled up the first BWX I took 2 months ago and the calc was there in that one. I thought I had removed it but guess what....I suck! I need to go back to remedial scaling school! I am so embarrassed. I want to go to that man's house and clean that calc off there. It has taken me over a year to understand why WSU professors required me to go to extra VA sessions to get more practice. When I asked the professors what I needed to focus on to improve my skills I could not get a straight answer. They seemed unsure why I was in extra sessions and to take it as a gift for extra tutelage. I did. I am really grateful for the opportunity I was given in school. Today I realize why.