A dental unit control and service system includes a unit (6) for checking values (Vr) correlated with main (4) and secondary (5) pieces of equipment, the said values (Vr) being compared with preset reference values (Vc); an alarm device (7) connected to the unit (6) and designed to issue a positive output signal (SP) when a difference between the values checked (Vr) and the reference values (Vc) is found, the signal also indicating the different item or items of data correlated with the piece or pieces of equipment (4, 5); a device (8) for activating a remote call unit (9) which establishes an on-line link with a remote service unit (10) capable of interacting directly with the microprocessor unit (1) that monitors the dental unit.