Problem children have great difficulties, as well to study any kind of language as to study mathematics. Papy F. and Papy G. have described a method to teach mathematics in the primary school. This method, based upon a non verbal language, has been applied to several groups of problem children. It gave them the opportunity to progress a lot in mathematics. We study now the (possible) influence of this method on the evolution of their language and so of their psycho-pathological behaviour.