Which of the following conditions must be met for a dental assistant to perform pit and fissure sealants?

For a dental assistant to perform pit and fissure sealants, both conditions outlined in the choices are necessary. The requirement for the assistant to hold a pit and fissure sealant certificate is crucial, as this certification demonstrates that the assistant has received specific training and competency in applying sealants safely and effectively. This requirement exists to ensure that the assistant has the proper knowledge and skills to perform the procedure within the scope of dental assisting practice.

Additionally, the condition related to the dentist being a Medicaid provider or practicing in an underserved area is important because it pertains to access to care. This regulation is designed to help ensure that sealant procedures are available to populations that may not have adequate dental services, thereby promoting oral health equity.

In summary, both the certification of the assistant and the practice parameters of the dentist align with best practices in dental care, ensuring safety, efficacy, and increased access to preventive services. Hence, the correct choice is that both conditions must be met for the dental assistant to perform this procedure.