Final answer:
Single-use disposable items such as prophy angles, prophy cups and brushes, tips for high-speed evacuators, saliva ejectors, air/water syringe tips, and gloves should be used for one patient and one procedure only.
Step-by-step explanation:
The correct answer is a) One, one procedure only. Single-use disposable items such as prophy angles, prophy cups and brushes, tips for high-speed evacuators, saliva ejectors, air/water syringe tips, and gloves are designed to be used for one patient and one procedure only. These items are meant to maintain proper hygiene and prevent cross-contamination between patients. After each use, they should be discarded and replaced with new ones to ensure the safety of both patients and healthcare professionals.