Years ago, as a brand new and substitute dental hygienist, I came across a very odd-looking machine -- an air polishing unit.
http://www.rdhmag.com/articles/print/volume-33/issue-7/features/the-trek-to-positive-polishing.html
http://www.rdhmag.com/articles/print/volume-33/issue-7/features/the-trek-to-positive-polishing.html
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