Which polishing agent is known to be made of precipitated chalk?

Whiting is a polishing agent specifically known for being composed of precipitated chalk, which is primarily made of calcium carbonate. This makes it effective in providing a gentle abrasive action that is suitable for polishing dental surfaces. Its soft properties allow for effective cleaning and polishing without causing damage to the enamel of the teeth.

In dental applications, whiting is frequently used because it is mild enough to avoid scratching while still enhancing the shine and smoothness of dental surfaces. Its origin from chalk makes it an ideal choice in scenarios where a soft yet effective polishing agent is needed.

The other options, while also used for polishing, consist of different materials with distinct properties and applications. Pumice is a volcanic ash with a harder texture, emery is a harder material often used for grinding, and silex is composed of silica and is more suitable for etching rather than polishing.