• Press the "ON" button to activate the countdown display system. This screen displays the number of days left before the solution has expired. At the end of every 24-hour period, the countdown display indicates one day less.

• After seven days of use the countdown display will reach "0", indicating that it is time for you to prepare a new NovaDent cleansing solution.

• When the new solution is prepared, press the "ON" button to restart the 7-day countdown system.