Mouthwashes contain a variety of ingredients depending on the reason for the particular use of each one. Which one of the following ingredients is added specifically to aid healing by the elimination of anaerobic bacteria?

The correct choice is hydrogen peroxide, as it is specifically known for its ability to aid in the healing process and is effective against anaerobic bacteria. Hydrogen peroxide works by releasing oxygen when it comes in contact with tissues; this oxygenation creates an aerobic environment that is hostile to anaerobic bacteria, which thrive in low-oxygen conditions. By eliminating these bacteria, hydrogen peroxide can help reduce infection risk and promote faster healing of wounds in the oral cavity.

While chlorhexidine is commonly used as an antimicrobial mouthwash and helps control plaque and reduces gingivitis, its primary benefit is not explicitly about promoting healing, but rather about bacterial control. Sodium fluoride is primarily included in mouthwashes for its cavity-preventing properties and strengthening enamel, while triclosan also serves an antimicrobial purpose but is not specifically aimed at healing through the elimination of anaerobic bacteria. Thus, hydrogen peroxide stands out for its unique action in facilitating a healing environment.