First of all, the authors remind us of the existence of toxic-origined psychic troubles, derived from some anti-tuberculous antibiotics, which raise a more biological than psychiatric problem. The prevention of the real psychic troubles, bears upon the structures which have been settled inside the Foundation «Santé des Etudiants de France» for many years: an organisation which enables studies to be carried on, which enables physical training, kinesitherapy, relaxation, and which is as open as possible to the normal world (with visits, leaves of absences, exchanges,...). The most important element lies in the quality of the relationship between physicians and patients in sanitarium; the physician endeavouring to be always at his patient's disposal, and less 'controlling' than in the past. The 1959–1960 inquiry had shown a 7 % psychiatric morbidity among the adolescents treated in sanitarium. The psychotherapeutic treatment meets some difficulties specific to collective life, with the risky adjustment of a psychotherapist in the hierarchy. Consequently, we should be content with analytically-inspired psychotherapies more concerned with the symptoms than with the personalities of patients.