What task requires formal training for applying cavity liners?

The correct answer indicates that applying cavity liners requires formal training when done under indirect supervision. This aligns with the regulations surrounding the practice of dental hygiene in Florida, which dictate that certain procedures, including the application of cavity liners, necessitate specific training to ensure safety and effectiveness.

In practice, indirect supervision means that a licensed dentist must be physically present in the office but does not need to be present while the procedure is being performed. Since cavity liners play a critical role in protecting the dental pulp and providing a thermal barrier, it's essential that the clinician has received proper education and training to understand the materials, their application techniques, and the potential implications for patient care.

This training not only ensures that the hygienist is capable of performing the task correctly but also guarantees adherence to safety protocols and regulations designed to protect patients during dental procedures. Failure to follow these regulations could lead to improper application, resulting in adverse effects on the patient's dental health.

The other options suggest scenarios where formal training is not a requirement, which does not comply with the established dental hygiene laws in Florida, thereby underscoring the importance of appropriate training and supervision for this specific task.