Tooth sharpener

A tooth sharpener is a device used by the Ferengi to keep their teeth as sharp as possible.

When Quark and Rom were children, Rom used a latinum tooth sharpener, while Quark had to use a wooden chewstick. 

In 2372, Nog sold Worf his tooth sharpener before he left Deep Space 9 for Starfleet Academy. 

Later that year, a Dopterian burgled Worf's quarters, stealing several items, including his tooth sharpener. 

In 2376, holographic advertisements for tooth sharpeners were being shown in the Fram Memorial Spaceport when Quark, Nog and Ro Laren arrived there.