An alert notification device of a dental processing machine includes a receiver, a first extractor, and a notifier. The receiver receives error information from the dental processing machine. The first extractor extracts from the error information received by the receiver, as first extracted error information, error information that occurred in a predetermined first time. The notifier notifies a management device to be used by a maintenance company to perform maintenance of the dental processing machine, of an alert concerning the first extracted error information.

An alert notification device of a dental processing machine includes a receiver, a first extractor, and a notifier. The receiver receives error information from the dental processing machine. The first extractor extracts from the error information received by the receiver, as first extracted error information, error information that occurred in a predetermined first time. The notifier notifies a management device to be used by a maintenance company to perform maintenance of the dental processing machine, of an alert concerning the first extracted error information.