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A ratchet consists of a round gear or a linear rack with teeth, and a pivoting, spring-loaded finger called a pawl (or click, in clocks and watches [1] [2]) that engages the teeth. The teeth are uniform but are usually asymmetrical, with each tooth having a moderate slope on one edge and a much steeper slope on the other edge.
We asked professionals about the best teeth whitening kits available—from easy pens to stay-put strips—that make brightening your smile practically seamless. The 12 Best Teeth Whitening Kits ...
Hirth joint made from anodized aluminum to show the meshing of the teeth Hirth joint (disassembled) between the semi-axles of a Campagnolo Ultra-Torque crankset. A Hirth joint or Hirth coupling is a type of mechanical connection named after its developer Albert Hirth. It is used to connect two pieces of a shaft together and is characterized by ...
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Dental floss is either a bundle of thin nylon filaments or a plastic ribbon used to remove food and dental plaque from teeth. Levi Spear Parmly, a dentist from New Orleans, is credited with inventing the first form of dental floss. He had been recommending that people should clean their teeth with silk floss since 1815. [25] [57] 1816 Milling ...