Final answer:
Dental personnel are indeed at risk of exposure to contaminated aerosols from dental unit waterlines, which can lead to infections.
Step-by-step explanation:
It is true that dental personnel are exposed to contaminated dental unit waterlines (DUWLs) through the inhalation of the aerosol generated by hand pieces and air-water syringes. When dental equipment like hand pieces and syringes are used, they create a spray that can contain microorganisms from the waterlines. This aerosolized water can be inhaled by dental professionals, which increases the risk of exposure to infections. The contaminated aerosol can carry bacteria and other pathogens leading to respiratory illness or other health conditions. Hence, proper maintenance of DUWLs and the use of personal protective equipment (PPE) is paramount to reduce the risks of exposure.