The instrument is to be at a 70 - 80 degree angle to the tooth. This provides the best angle with which to take off calculus without burnishing it. I first use an exploratory stroke to find the calculus and then a working stroke to remove it. This is important because you don't want to be doing unnecessary instrumentation on the tooth.
I find that I know when I have the right angulation because the instrument grabs and you can hear a scraping sound.
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