Under what type of supervision can a Dental Hygienist apply topical preventive or prophylactic agents?

The correct answer is that a dental hygienist can apply topical preventive or prophylactic agents under general supervision. In this context, general supervision means that the dentist does not need to be physically present in the office at the time the procedures are performed; however, they must have authorized the procedures ahead of time. This enables dental hygienists to carry out specific tasks independently, supporting their role in preventive care without the constant oversight of a dentist.

General supervision is significant as it allows dental hygienists to effectively engage in their duties to promote oral health and provide necessary treatments to patients, such as the application of fluoride or sealants, which are essential in preventing dental decay. This model of supervision is designed to enhance patient access to care while ensuring that qualified professionals are making informed decisions about treatment.

The other options reflect limitations that are not applicable in this case. Close supervision would require the dentist to be present during the application of these agents, which is not necessary under general supervision arrangements. "Not at all" implies that dental hygienists cannot perform these tasks, which contradicts their authorized scope of practice. Independent practice would suggest they perform these tasks without any supervision or pre-approval, which is not accurate in Washington State law concerning dental hygiene practices.