Which of the following describes concave?

Concave refers to a surface that curves inward or is recessed, resembling the interior of a bowl or a cave. This characteristic creates a dip or indentation, distinguishing it from other surface types. In the context of dental terminology or anatomy, identifying surfaces as concave is crucial because such shapes can affect how instruments like polishers or tools interact with teeth.

Understanding the definition of concave helps with proper techniques in coronal polishing, focusing on how to approach the varied surfaces of teeth during a polishing procedure. This knowledge is essential for ensuring effective cleaning while avoiding damage to the enamel or surrounding tissues.