Daily maintenance of dental air compressor for sale: clean up dust, record the time of refueling and shutting down, add water to the air compressor tank, and check if there is any abnormal noise. 2. Monthly maintenance of dental compressor for sale: Check whether the pipeline is leaking, focusing on the metal hose and solenoid valve. 3. Dental compressor machine maintenance every year: Tighten the screw in the distribution box; replace the filter element of the air compressor inlet, and check the automatic drainage pipeline of the refrigerated dryer. 4. Mid-to-late maintenance (2 years): Replace the automatic drainage pipe of the refrigeration dryer; check and replace the metal hose.