A cosmetic or dermatological system includes a packaging and dispensing device including one or more compositions on the basis of which a product is delivered, an adjustment system coupled or able to be coupled to the packaging and dispensing device, making it possible to modify the amount dispensed and/or at least one property of the product dispensed by the packaging and dispensing device, an electronic means for executing a program and acting automatically on the adjustment system, or for indicating to the user an action to be exerted on the adjustment system, to make the adjustment evolve in the course of the use of the device, the program determining the evolution of the adjustment as a function at least of a quantity representative of the number of uses of said device or of the amount of said product or of at least one of said compositions and already dispensed.