Dental care apparatus, which apparatus includes • at least two devices for dental care work, and connected to a network, namely two of the following: a dental unit, a patient chair, a computer, an intraoral x-ray device, a panoramic x-ray device, a panoramic/skull imaging device, a computer tomography imaging device of the skull area and • at least one user interface being adapted to send control commands to the at least two of said devices used in connection with dental care work, wherein • said user interface contains a touch pad or touch screen containing a display or it contains an arrangement containing said both functionalities, wherein • a means is arranged to the user interface being adapted to change the operation of the user interface between controlling at least a first and a second device of said at least two devices and wherein • a fixed or a detachable connecting means is arranged to said user interface said connecting means is adapted to detachably connect the user interface to a person, to clothing of the person in question or to the dental unit, or it is arranged as a fixed or a detachable part of clothing arranged to be separately dressed on the person in question or of some other structure to be dressed on characterized in that • the apparatus contains at least two devices which are arranged in functional connection with said user interface in such a way that each device provides an identification signal of essentially equal intensity, and that the user interface contains means to recognize, from which of the devices received identification signal is the strongest, and means for locking the user interface to control the device sending the strongest signal. • at least two devices for dental care work, and connected to a network, namely two of the following: a dental unit, a patient chair, a computer, an intraoral x-ray device, a panoramic x-ray device, a panoramic/skull imaging device, a computer tomography imaging device of the skull area and • at least one user interface being adapted to send control commands to the at least two of said devices used in connection with dental care work, wherein • said user interface contains a touch pad or touch screen containing a display or it contains an arrangement containing said both functionalities, wherein • a means is arranged to the user interface being adapted to change the operation of the user interface between controlling at least a first and a second device of said at least two devices and wherein • a fixed or a detachable connecting means is arranged to said user interface said connecting means is adapted to detachably connect the user interface to a person, to clothing of the person in question or to the dental unit, or it is arranged as a fixed or a detachable part of clothing arranged to be separately dressed on the person in question or of some other structure to be dressed on characterized in that • the apparatus contains at least two devices which are arranged in functional connection with said user interface in such a way that each device provides an identification signal of essentially equal intensity, and that the user interface contains means to recognize, from which of the devices received identification signal is the strongest, and means for locking the user interface to control the device sending the strongest signal. <EOS>