Drool control: long-term follow-up.

This study reports the long-term follow-up of a group of severely retarded cerebral-palsied children who were conditioned to control their oral drooling by means of an electronic device and shaping and conditioning procedures. Improvement was maintained in these children at nine months, and a larger group of children who were trained by the same method attained significant improvement in drooling both at one week and at three months.