Final answer:
To prevent soft tissue injuries post local anesthesia, a patient should avoid hot drinks, avoid eating for 4 hours, and keep a cotton roll in the mucobuccal fold.
Step-by-step explanation:
The advice that can help a patient prevent soft tissue injuries following local anesthesia includes avoiding hot drinks for 4 hours following the procedure, not eating for 4 hours, and keeping a cotton roll attached to a floss in the mucobuccal fold. All these precautions assist in preventing injury to the soft tissues that may be numb or less responsive after receiving local anesthesia, hence reducing the risk of burns, bites, or other injuries.