Which requirement is NOT necessary for a public health hygienist working independently?

For a public health hygienist working independently, direct supervision from a dentist is not a necessary requirement. Public health hygienists often operate in settings such as community health programs or schools, where they are focused on preventive care and education rather than individual patient treatment that would typically require a dentist's direct oversight.

The role of public health hygienists is designed to empower them to perform assessments, provide preventive care, and educate communities about oral health without the need for a supervising dentist to be physically present. This independence allows for efficient public health initiatives aimed at improving community health outcomes.

On the other hand, maintaining patient records, engaging in continuing education on topics like substance abuse, and participating in public health education are crucial components of their responsibilities. These elements ensure that the hygienist remains competent, informed, and effective in promoting oral health within the community.