Is it possible to eliminate biofilm completely? If sterile water is used in the self-contained reservoir, will the water that enters the patient’s mouth be sterile? How often should microfilters be...

Is it possible to eliminate biofilm completely? If sterile water is used in the self-contained reservoir, will the water that enters the patient’s mouth be sterile? How often should microfilters be changed?  What precautions should you take when selecting a chemical for the dental unit?