The invention relates to a device which is inserted into the mouth so as to isolate the dental part or area of the mouth to be treated, allowing improved vision, preventing the cheek and the tongue from impinging on the working area, and protecting the tissues of the patient from the dental instruments. Furthermore, the sucking capacity of the device prevents the saliva or any other fluid generated during the treatment from affecting both vision and the performance of a correct technique for carrying out the dental treatment.
