If I see the calculus radiographically I will take an explorer first a feel for the calculus to determine how big it is, how deep, more buccal or lingual. Doing this helps to remove it in less strokes. I will also use a light touch on the curet/gracey to feel that I’m at the base of the calculus and then apply lateral pressure to remove the calculus. Hope this helps!
I love the ultrasonic for this. Make sure you are at an edge of the calculus and lightly “tap” it. It almost always will break up and float out of the pocket. If you use any pressure with the tip, it can burnish and make things more difficult. I then always go back with a hand scaler to smooth.
Another trick for tenacious deposits is using files. Ensure you are below the deposit and the file is adapted, firm stroke upwards. 🙂