Which of the following methods can help reduce aerosol spray during procedures?

Using a face shield is a method that can significantly reduce the risk of aerosol spray during dental procedures. Face shields act as a barrier, helping to protect the face and eyes from potential splashes and airborne particles that may be generated during procedures, particularly those that involve high-speed instruments. The shield covers a larger area than a mask alone, providing an additional level of protection for the dental staff and patients from contaminants.

While closing all windows in the room may minimize external airflow, it does not specifically target the reduction of aerosol generation during procedures. Similarly, using handpieces with low speed might create less aerosol than high-speed handpieces but does not eliminate it completely. Direct suction can help manage aerosol but is typically used alongside other protective equipment; relying solely on this method may not be sufficient to fully address aerosol risks. Hence, utilizing a face shield is the most effective answer in this context for minimizing aerosol exposure during dental procedures.