Because you don’t scrap your teeth with sharp metal twice a day everyday your entire life. If you did, you certainly would cause damage to your teeth.
Plus, dentists and techs really aren’t putting that much pressure on those tools. Sure because they’re hard metal you can feel it/hear it. But they really aren’t pushing on your tooth itself that hard. Just enough to get plaque off.
It’s the difference between searching your arm lightly when you have an itch, vs really digging your nails into your arm and scratching them up a bunch
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