Assistina 301 Plus The Assistina can save you time and money, while also extending the life of your handpieces, motors, and attachments. Simply put, this unique device turns handpiece maintenance into an easy and consistent process. At the touch of a button, the Assistina automatically cleans spray coolant lines, sends a precise amount of lubricant through drive air channels while rotating turbines and gears, then expels excess fluid and debris?all for less than 2 cents per cycle.