When re-implanting a knocked-out tooth, which of the following is NOT recommended?

Rinsing the tooth with water is not recommended because it can wash away essential cells that are vital for the tooth's viability. When a tooth is knocked out, the periodontal ligament cells, which are crucial for reattachment, can be damaged by water or other solvents. Instead, it's better to handle the tooth carefully and keep it moist, preferably in the individual's saliva or a designated tooth preservation solution.

Handling the tooth only by the crown helps minimize damage to the root and the periodontal tissues. Keeping the tooth moist is also critical to maintaining the health of these vital cells. Replacing the tooth immediately into the socket is often the best course of action, as it increases the chances of successful re-implantation. Thus, avoiding rinsing the tooth with water is key to preserving its ability to reintegrate into the mouth after an avulsion injury.