There is no doubt in efficacy of PNF techniques. But let me clear that PNF techniques are used only in the recovery phase of facial nerve for re education when muscles start to show the signs of contraction or activity.
barrybert you are blitzing this site with meaningless one liners - probably to advertise your Resume writing service. However this one really contains some misinformation. there is no solid evidence that I can find for the use of PNF for The recovery phase of Bells palsy. In contrast to PNF a number of different techniques have been tested and the ones that come up strongest are:
  • various types of electrostimulation
  • various exercise regimes

One particularly interesting exercise programme is Mime therapy which is about the adoption of facial gestures.

There is a good Cochrane review that covers the territory well:

Physical therapy for Bell´s palsy (idiopathic facial paralysis)

Not only is there an absence of evidence for the effectiveness of PNF in facial paralysis rehab. It is also basically implausible. PNF uses a number of proprioceptors but the primary ones are the muscle spindles. However the facial muscles lack muscle spindles unlike their somatic counterparts. so all the quick stretching in the world probably ain't doing anything.

have a read of:
  • Shahani BT, Young RR: Blink reflexes in orbicularis oculi, in Desmedt JE (ed): New Developments in Electromyography and Clinical Neurophysiology. Basel, Karger, 1973, vol 3, pp 641-659.
  • Brodal A: Neurological Anatomy: In Relation to Clinical Medicine, ed 3. New York, Oxford University Press, 1981, pp 495-508.