Final answer:
A CNA should use a soft toothette when performing oral care on an unconscious resident due to its design for gentle cleaning and reducing the risk of choking or aspiration.
Step-by-step explanation:
When performing oral care on an unconscious resident, a CNA (Certified Nursing Assistant) must use specific tools to maintain the resident's oral hygiene safely. The most appropriate tool to use is 2) A soft toothette. This is because a soft toothette is specially designed for gentle cleaning and can be used to apply moisture and help clear debris without causing harm or discomfort to the resident. Mouthwash and a regular toothbrush may not be suitable for an unconscious resident due to the risk of choking or aspiration. Therefore, while providing oral care, a CNA should always prioritize the safety and the specific needs of the resident.