Supragingival and subgingival use Areas of use: universal Can be used with supra and subgingival powders In the supragingival technique, the air-polishing handpiece should be maintained under a constant circular motion at a distance of 4-5 mm from the surface and for about 5 seconds per tooth. For maintenance therapy, the work must be performed using an incidence angle between powder jet and tooth axis of between 30 and 60 degrees. The correct handpiece angle is essential to prevent soft tissue trauma and to reduce the amount of aerosol emitted.