A hair information determination device (100, 100a) for providing information relating to hair of a user, comprising: a device body having at least a first region (100K1) and a second region (100K2) which are designed in such a way that the hair of the user can be moved between the first region (100K1) and the second region (100K2) while in contact with the first region (100K1) and the second region (100K2); at least one microphone arranged in or on the device body for detecting a noise during a movement of the hair between the first region (100K1) and the second region (100K2); a speed sensor circuit arranged in or on the device body, comprising at least one sensor for determining a value which represents a speed of the device body; and an electronic circuit device arranged in or on the device body, the electronic circuit device being coupled to the at least one microphone and the speed sensor circuit for receiving the detected noise and the speed of the device body, and the electronic circuit device being configured to provide the user with information relating to the hair, based on the received detected noise and the speed of the device body, characterized in that the information relating to the hair of the user comprises an external degree of hair damage, a frequency spectrum of the detected noises in a frequency range of 86 Hz to 22011 Hz being compared with a plurality of reference frequency spectra, the reference frequency spectra comprising frequency spectra of hair, the degree of hair damage of which is known and frequency spectra of which are assigned by means of a database, the external degree of hair damage of the user being assigned to an external degree of hair damage of the most similar reference frequency spectrum. a device body having at least a first region (100K1) and a second region (100K2) which are designed in such a way that the hair of the user can be moved between the first region (100K1) and the second region (100K2) while in contact with the first region (100K1) and the second region (100K2); at least one microphone arranged in or on the device body for detecting a noise during a movement of the hair between the first region (100K1) and the second region (100K2); a speed sensor circuit arranged in or on the device body, comprising at least one sensor for determining a value which represents a speed of the device body; and an electronic circuit device arranged in or on the device body, the electronic circuit device being coupled to the at least one microphone and the speed sensor circuit for receiving the detected noise and the speed of the device body, and the electronic circuit device being configured to provide the user with information relating to the hair, based on the received detected noise and the speed of the device body, characterized in that the information relating to the hair of the user comprises an external degree of hair damage, a frequency spectrum of the detected noises in a frequency range of 86 Hz to 22011 Hz being compared with a plurality of reference frequency spectra, the reference frequency spectra comprising frequency spectra of hair, the degree of hair damage of which is known and frequency spectra of which are assigned by means of a database, the external degree of hair damage of the user being assigned to an external degree of hair damage of the most similar reference frequency spectrum.