Tungo and all ,

As for facial palsy and Bell,s palsy ,try to be so gently because you may share in developing complications to the patient like the most common problem Synkinesis that can develop simply because of pushing forward for improving the muscle power .I do NOT support using electrotherapy espicially using long times /periods e.g. Ultrasound therapy ,current research says it can has side effects over nerves .

After long time of dealing with facial palsy ,i think the most appropriate for those victims is Education regarding what can share in developing Synkinesis which usually occurs in severe facial nerve injuries .
Currently , i use Imagery exercises of the facial muscles to activate cortical presentations and at the same time avoid developing synkinesis .

Best Wishes
Emad