What is one characteristic of a treatment facility?

The correct answer indicates that a treatment facility can be a mobile dental unit, which highlights the flexibility and adaptability of dental care delivery. Mobile dental units are specially designed vehicles that provide dental services outside of a traditional office environment, allowing access to patients who may have difficulty reaching fixed facilities, such as those in rural areas or individuals with transportation challenges. This characteristic underscores the importance of accessibility in dental hygiene, allowing professionals to meet patients where they are and ensuring that a broader segment of the population can receive necessary dental care.

Other characteristics mentioned in the options, such as needing to be within city limits, providing extended hours, or serving only children, impose limitations that are not universally applicable or required for all treatment facilities. By recognizing that mobile dental units meet the criteria for treatment facilities, it acknowledges the diverse ways in which dental care can be effectively delivered.