Tooth chair: every time the machine should be sterilizing every time the machine is sterilizingTooth chair: every time the machine should be sterilizing every time the machine is sterilizingTooth chair: every time the machine should be sterilizing every time the machine is sterilizingTooth chair: every time the machine should be sterilizing every time the machine is sterilizingTooth chair: every time the machine should be sterilizing every time the machine is sterilizing