California Registered Dental Assistant (RDA) Written Practice Exam

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What is the main ingredient in a cavity varnish?

Fluoride
Calcium
Resin
Ethanol

The correct answer is: Resin

A cavity varnish is a type of dental treatment used to help prevent tooth decay. It is typically applied to the surface of the teeth and can provide protection for months. The main ingredient in a cavity varnish is resin. Resin is a natural or synthetic compound that hardens when exposed to certain chemicals or light, creating a protective barrier on the teeth. Fluoride, calcium, and ethanol may also be found as ingredients in some cavity varnishes, but they are not the main ingredient and are often used for additional benefits such as strengthening enamel or killing bacteria. Therefore, they are not the most important component in the formulation of a cavity varnish.