Before examining the mouth of an adult client, the nurse should first

Oral examination involves direct contact with mucous membranes, exposure to saliva droplets, and potential transmission of infectious microorganisms, requiring standard precautions focused on barrier protection to prevent cross-contamination and occupational exposure during physical assessment procedures in clinical practice. Rationale: A. Goggles provide eye protection against splashes or aerosolized secretions. They are indicated for high-risk procedures involving fluid sprays. Routine oral examination does not typically generate splashes. Therefore, goggles are not the primary required precaution for a standard mouth assessment. B. Mask use provides droplet protection when exposure to respiratory secretions is anticipated. During a routine oral exam, aerosol generation is minimal. Masks may be used in infection control settings but are not the essential initial barrier for mouth inspection. C. Gown use provides body fluid barrier protection during procedures with risk of extensive contamination. Oral examination does not involve significant fluid exposure to clothing. Thus gowns are unnecessary for routine assessment unless gross contamination is expected. D. Clean gloves provide contact barrier protection against saliva and oral mucosal microorganisms during examination. They prevent transmission of pathogens between nurse and client. Gloves are mandatory standard precaution for direct oral cavity inspection and physical contact with mucous membranes.