What is the purpose of cavity varnishes in dentistry?

Cavity varnishes primarily serve as sealers. Their main purpose is to provide a barrier that helps to seal dentin tubules, which can reduce the potential for post-operative sensitivity and help protect the underlying tooth structure from the ingress of bacteria and moisture. The sealing properties of cavity varnishes contribute to the overall health of the tooth by preventing saliva and other contaminants from affecting the dental material that is used in the cavity preparation.

In addition to their sealing capabilities, cavity varnishes may also have some insulating properties, which can help to mitigate thermal and chemical irritation, but their primary function remains focused on sealing. The aesthetic appeal of restored teeth is generally enhanced through other restorative materials rather than varnishes, which are not designed for cosmetic purposes.