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I'm a dental hygienist and the floor in my operatory is no where near being level, mostly due to the fact that the building is almost a century old. I've had to come up with a very specific way of laying out my instruments, gauze, floss, and polishing paste on the tray that comes off of the arm attached to the chair. If I deviate from this set up, the instruments roll to the edge every time I move the tray and the paste (in an ergonomic finger holder) rolls to the floor.
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