To avoid injury, the rubber polishing cup is directed __________ the gingival third and pressed _________ against the tooth surface.

The correct response indicates that the rubber polishing cup is directed away from the gingival third and pressed lightly against the tooth surface. This technique is essential to prevent injury to the gums and underlying tissues during the polishing process.

By directing the polishing cup away from the gingival area, the risk of causing trauma to delicate gingival tissue is minimized, which is crucial for maintaining the health of the gums. A gentle touch in applying the cup ensures that the tooth surface is polished effectively without exerting excessive pressure that could lead to discomfort or damage.

Light pressure is appropriate because it allows for an effective cleaning and polishing action without creating potential harm to the periodontal structures. Understanding the correct technique is vital for dental assistants to deliver safe and effective patient care, preserving both oral health and comfort.