Device for implementing a method for analyzing a patient's real dental situation, the method comprising a series of cycles of steps A) to C), a cycle of steps A) to C) comprising the following successive steps: A) at an up-to-date time, acquiring an up-to-date image representing a real dental scene comprising an orthodontic appliance worn by the patient as observed by an operator; B) determining a virtual dental scene on the basis of the representation of the real dental scene on the up-to-date image, the virtual dental scene comprising a representation of the orthodontic appliance worn by the patient, and/or information on a target location for the orthodontic appliance; and identifying an element of the virtual dental scene which does not comply with an evaluation criterion, and highlighting this element in the virtual dental scene and/or adding a message relating to said element to the virtual dental scene, the evaluation criterion relating to the positioning of the orthodontic appliance worn by the patient and/or the state of the orthodontic appliance worn by the patient; then C) presenting, on a screen, the virtual dental scene transparently and superimposed over the real dental scene, or displaying the up-to-date image on a screen and presenting the virtual dental scene superimposed over the representation of the real dental scene on the up-to-date image displayed on the screen, transparently or not over said representation; step A) being repeated less than 5 seconds after step C), the device comprising: - a camera configured to implement step A); - a processing unit configured to implement step B); - a screen for implementing step C); the camera, processing unit and screen being configured to communicate with one another in order to implement said steps. A) at an up-to-date time, acquiring an up-to-date image representing a real dental scene comprising an orthodontic appliance worn by the patient as observed by an operator; B) determining a virtual dental scene on the basis of the representation of the real dental scene on the up-to-date image, the virtual dental scene comprising a representation of the orthodontic appliance worn by the patient, and/or information on a target location for the orthodontic appliance; and identifying an element of the virtual dental scene which does not comply with an evaluation criterion, and highlighting this element in the virtual dental scene and/or adding a message relating to said element to the virtual dental scene, the evaluation criterion relating to the positioning of the orthodontic appliance worn by the patient and/or the state of the orthodontic appliance worn by the patient; then C) presenting, on a screen, the virtual dental scene transparently and superimposed over the real dental scene, or displaying the up-to-date image on a screen and presenting the virtual dental scene superimposed over the representation of the real dental scene on the up-to-date image displayed on the screen, transparently or not over said representation; step A) being repeated less than 5 seconds after step C), the device comprising: - a camera configured to implement step A); - a processing unit configured to implement step B); - a screen for implementing step C); the camera, processing unit and screen being configured to communicate with one another in order to implement said steps. displaying the up-to-date image on a screen and presenting the virtual dental scene superimposed over the representation of the real dental scene on the up-to-date image displayed on the screen, transparently or not over said representation; step A) being repeated less than 5 seconds after step C), the device comprising: - a camera configured to implement step A); - a processing unit configured to implement step B); - a screen for implementing step C); - a camera configured to implement step A); - a processing unit configured to implement step B); - a screen for implementing step C); the camera, processing unit and screen being configured to communicate with one another in order to implement said steps.