For the easy removal of strong dark stains and calculus. Supragingival use on lingual-anterior and labial-premolar surfaces. A new standard in power scaling. The Focus Spray Inserts series provides enhanced scaling performance on light, moderate, and heavy calculus with reduced water supply. With a directed spray water supply, this system focuses the irrigation where it is most needed at the exact point of prophylaxis or treatment. The water management of FSI uses less water more effectively.