The electric stimulation of sensitive peripheric fibres has been used with good results in the control of pain. It is belived that the modern theory of pain phisiology offers scientific basis to explain its action mechanism. This method was applied to twenty-one patients suffering from trigeminalgia, being continually stimulated during thirty minutes with variable voltages, according to the affected region. As a result, it was obtained the immediate relief of pain for periods of time varying from six and forty-eight hours.