Sirovasti is considered the most effective mode of external oil application. Sirovasti is the technique in which warm medicated oil is kept on the head using a special cap. The oil is allowed to stay in the cap for 30 to 45 minutes. The temperature of the oil is maintained to a comfortabl warmth during the procedure, after which it is taken off and the head wiped off with a towel. A herbal powder is applied on the crown of the head at the end of the treatment.