Which of the following actions indicates nervousness from a patient during treatment?

Locking ankles can be a significant indicator of a patient's nervousness during treatment. This physical behavior often suggests an attempt to create a sense of personal security or to hold oneself together in a stressful situation. When patients feel anxious, they may unconsciously adopt closed-off or protective body language, which can include locking their ankles, signaling that they are uncomfortable and possibly trying to brace themselves for the experience.

In contrast, talking excessively can sometimes be a coping mechanism used by patients to distract themselves from anxiety, making it less of an indicator of nervousness and more about seeking relief or connection. Similarly, crossing arms may indicate discomfort or defensiveness, but it can also be a position of relaxation for some individuals and does not universally convey anxiety. Smiling frequently may appear as a sign of happiness or ease, but it can also be a way for a patient to mask their nervousness. Thus, while each of these actions can reflect varying emotional states, locking ankles specifically communicates a more distinct and often involuntary response to stress or anxiety during dental treatment.