The invention relates to an assembly having a refill and an appliance designed for using the refill, the appliance having an insertion guide along which the refill travels, the refill having an element that serves as a use memory and the accommodating structure having a relief that acts on said element when the refill is fitted on the appliance for the first time, so as to cause it to pass from an inactive configuration to an active configuration, the accommodating structure having a locking member disposed to as to intercept said element when the latter is in the active configuration, while the refill is being fitted in and removed from the accommodating structure, the locking member can be passed over by said element in the direction of removal of the refill and such that the locking member prevents said element from passing in the direction of insertion of the refill.