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The author conceives of the issue of change in language in adolescence as the working of that mutative dimension entirely expressed by the pubertal process. The destitution, which can at any moment be worded, attests to the lack which is consubstantial with any language. The research carried out by the adolescent consists of unveiling this signifying lack, while making sure the register of language stays permanent. This “work” is more generally part of a regime of proof of which other people, more than ever, remain the guarantors. It is by the other that the address and its reception would be assured of a kind of permanence, despite this signifying lack.