are the results of more than 30 years of hands-on clinical and manufacturing experience. Their sharpness and human-factored design make them an unequaled value. PDT's line of products includes curettes and scalers like the Montana Jack, Queen of Hearts periodontal, Gracey, and specific lines of anterior, universal, distal, buccal & lingual, mesial & posterior instruments. 100% of PDT hygiene products are hand-made in the USA.