The invention relates to an intraoral device for automated preparation of the teeth with a view to performing partial or peripheral dental restoration, which includes: a splint (1) suitable for being positioned in the mouth of a patient, said splint including a means (13) for maintaining the position thereof inside said mouth at least one mobile cutting tool (2) combined with said splint and an electronic management unit which makes it possible to control said cutting tool, characterized in that: said cutting tool (2) is configured so as to cut at least the labial surface of the tooth (D1) to be prepared, said tool being mounted on a mobile carriage (23) moving along a rail (24) attached to the splint (1), opposite the labial surface of the tooth (D1) to be prepared, said rail having a curvature that matches the dentition (D) of the patient said splint (1) includes at least one 3D digitization tool (4) arranged such as to digitize at least the labial surface of said tooth to be prepared, said digitization tool being connected to the management unit (6) so that the digitized data can be transferred to said management unit and said management unit is configured so as to control the movement of said cutting tool (2) in accordance with the digitized data.
