Visualization device of the interior of oral cavities, coupled to a dentist's chair for indirect visualization of the interior of an oral cavity, comprising: - a gripping handle (1), inside which a conduit (4) for supplying a compressed air flow, connectable to a corresponding compressed air pipe of the chair, runs； - a circular mirror (3), and - a support (2) attachable to the handle (1) for suspension of the mirror (3), by whose interior the flow of compressed air conveyed by the conduit (4), support (2), which comprises: - a semicircular base (13) located at a distal end of the support (2), and - a perimetral groove located in the base (13) for housing a sector of the perimeter edge of the mirror (3), the display device being characterized in that the base (13) incorporates a semicircular diffuser (14) of air, which extends along the entire perimeter of the base (13), configured and dimensioned for addressing on the surface of the mirror (3) of the circulating compressed air inside the support (2) in the form of a continuous laminar flow. (Machine-translation by Google Translate, not legally binding)1. Dispositivo de visualización del interior de cavidades bucales, acoplable a un sillón de dentista para visualización indirecta del interior de una cavidad bucal, que comprende: - un mango (1) de asido, por cuyo interior discurre un conducto (4) de suministro de un flujo de aire comprimido, conectable a una correspondiente tubería de aire comprimido del sillón, - un espejo (3) circular, y - un soporte (2) acoplable al mango (1) para suspensión del espejo (3), por cuyo interior discurre el flujo de aire comprimido transportado por el conducto (4), soporte (2) que comprende: - una base (13) semicircular localizada en un extremo distal del soporte (2), y - una acanaladura perimetral localizada en la base (13) para alojamiento de un sector del borde perimetral del espejo (3), estando el dispositivo de visualización caracterizado por que la base (13) incorpora un difusor
