Saliva protects teeth against cavities more than we thought

Mucus which is part of the 0.5% of saliva that is not water - contains salivary mucins, compounds that actively protect teeth from damage by the cavity-causing bacterium Streptococcus mutans, according to a new study.

The researchers found that salivary mucins do not alter levels of S. mutans nor kill the bacteria over 24 hours. Instead, they keep the bacteria suspended in a liquid medium, and this in turn reduces their ability to form biofilms on teeth.