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On the mesial you are not setting your 70 degree angle. You are leaning the instrument away from the tooth surface when it should be towards so you are on the cutting edge and not on the lateral sides.
Do I need to stay subgingival the whole time? I didn't understand what my professors said about it
![ILLSLICK - THE KING'S LANDING [Freestyle]](http://i.ytimg.com/vi/feIJJnNkTfk/mqdefault.jpg)
On the mesial you are not setting your 70 degree angle. You are leaning the instrument away from the tooth surface when it should be towards so you are on the cutting edge and not on the lateral sides.
Do I need to stay subgingival the whole time? I didn't understand what my professors said about it