PDT, Inc., creators of the original Montana Jack® and innovators of Dental Product Design. The Amazing Gracey™, O'Hehir New Millenium Curettes, Wingrove™ Titanium instruments and the Queen of Hearts™ perio curette . PDT leads by innovating superior quality products for a lower price. We also manufacture and provide the finest sharpening systems and instrument cassettes. Our hygiene instruments are 100% Made in the U.S.A. Check out or new Restorative and Surgical line.