Prosthetic replacement of teeth primarily helps to restore proper mastication by replacing missing teeth, enabling efficient chewing function. It reinstates occlusal contacts, which maintain proper alignment and distribution of occlusal forces. Additionally, it helps in preserving periodontal health by preventing the drifting of adjacent teeth and overeruption of opposing teeth, thus maintaining the integrity of the dental arch and supporting structures. These factors collectively contribute to oral function and long-term dental stability.

Reference: Contemporary Fixed Prosthodontics, Rosenstiel, Land, and Fujimoto, 5th Edition.