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The therapeutic follow-up of an autistic adult allowed us to observe the long-term effects of sensorial dismantling on his buccal area and on his perception of the environment. The non-erotized buccal area seems reduced to a group of elements perceived as disparate: tongue, mucous membranes, saliva, etc. Each element is able to provide precise sensorial effects with a precise reassuring function. The therapy required some adjustments to the framework. At first the therapist had two specific functions: she was a stimulus barrier and a “moist” envelope. Then, she was able to be integrated as a support and a unification pole of the dismantled sensations. Later, harmony could emerge in the patient. The length of time spent by the patient seeking pressure or wetness sensations led us to the hypothesis that the pressure sensations had a moderating effect on the softer superficial sensations, which are linked to intra-utero experiences. These data need to be compared with the results of other studies of autistic adults.