What is the primary use of a push scaler in dental care?

The primary use of a push scaler in dental care is indeed to remove supra-gingival calculus, particularly from areas between interproximal surfaces. This tool features a blade designed to effectively scrape away plaque and calcified deposits that accumulate on the teeth above the gum line, which is essential for maintaining oral hygiene and preventing periodontal disease.

By focusing on the interproximal areas, the push scaler allows dental professionals to clean hard-to-reach spots effectively, which can harbor bacteria and contribute to cavities and gum issues if not addressed. While the other options may relate to dental care, they serve different purposes and involve other instruments. For instance, subgingival calculus removal typically requires specific curettes, polishing teeth is done with different tools like polishing cups or brushes, and filing and smoothing surfaces would more appropriately involve dental files or finishing instruments. Thus, the push scaler's specific design and function align it with the effective removal of supra-gingival calculus, especially in difficult areas between teeth.