The Assistina: A Perfect Tool for Internal Cleaning and Lubrication The Assistina was special designed to handle the cleaning of contra-angle hand pieces and turbines in dental circles. This device allows you focus on your practice while providing you with the sterilization procedures your tools require. Assistina 3x2 employs a two step process in getting your instruments ready the next step in the hygenic cycle. Step 1: The automatic internal cleaning of the spray channels and transmission parts with W&H Activefluid which it does by blowing through all available spray channels and transmission parts in an instrument with the help of compressed air Step 2: The lubrication of transmission parts with W&H service oil F1