Abstract: An apparatus and method for sterilizing air for medical uses applied to air compressors used in dentists' apparatuses. According to the invention, we use the heat of the air coming out from the air outlet provided on the head of the compressor, to reduce the bacterial charge of a filtering cartridge fitted on the conduits that feed the air to the devices. A body contains a sterilizing cartridge and a pipe coil or a conduit through which the air coming out of the head of the compressor passes, so that it is possible to use this heat for heating the cartridge thus reducing the bacterial charge of the same every time the compressor is turned on, without the need of disassembling parts or components.