Final answer:
Splinting the teeth for stabilization is the most effective supportive therapy for a patient's tooth mobility, as it physically secures the teeth and helps distribute masticatory forces evenly.
Step-by-step explanation:
The correct answer to address a patient's tooth mobility, based on the given options and reference material, is D. Splinting the teeth for stabilization. Splinting provides a physical means to reduce mobility and distributes the forces of mastication more evenly across a group of teeth. This procedure is especially beneficial for teeth that have been compromised due to periodontal disease, trauma, or other factors that affect the stability of teeth. The supporting information involving braces in the question indicates applying force to move and stabilize teeth, which aligns with the concept of splinting rather than the other options listed, which do not provide the necessary physical stabilization.
While options such as the fabrication of a night guard, biofeedback, and therapeutic massage might help reduce parafunctional habits or alleviate muscle tension, none address the immediate physical stabilization of mobile teeth like splinting does. Hence, the that splinting is recommended to provide immediate physical stabilization to the mobile teeth which is critical for their health and function.