Which desensitizing agent and its proposed mechanism of action is incorrect?

While calcium phosphates are well-known for their role in the remineralization of enamel and dentin, the specific mechanism is often misunderstood in the context of sensitivity reduction. The proposed mechanism of action primarily involves the deposition of calcium and phosphate ions that can help rebuild tooth structure and enhance mineral density. However, the term "remineralize enamel crystalline structure" may imply a direct effect where sensitivity is reduced purely through the formation of minerals. In fact, the process of remineralization itself involves more nuanced interactions and doesn't solely focus on crystalline structure per se but rather on the overall integrity of the enamel and dentin.

Furthermore, while fluoride ions do play a role in decreasing sensitivity by forming a barrier or "precipitating" in predentin or dentinal tubules, the main effect is through the enhancement of remineralization and reduction of demineralization processes, leading to decreased sensitivity over time. Thus, the aspect of solely attributing sensitivity reduction to crystallization lacks a comprehensive view of calcium phosphate’s full range of actions in dental health.