Physical therapy for facial nerve paralysis (Bell's palsy): An updated and extended systematic review of the evidence for facial exercise therapy.

Bell's palsy, a sudden facial nerve paralysis, often leaves people wondering whether facial exercises actually help recovery, and this review set out to update earlier evidence on that question. The authors searched for new research published since an earlier Cochrane review, comparing studies that tested facial exercise therapy against other approaches or no treatment, pooling randomised trials, observational studies, and smaller pilot studies totalling 854 participants. Across this mixed body of evidence, higher-quality studies tended to report positive effects of facial exercise therapy, including the four best-rated randomised trials and a smaller share of observational studies. However, the studies varied too much in design and outcome measures to be combined statistically, and several new review articles on the topic were judged to be of very low quality themselves.

The authors conclude the new evidence reinforces earlier conclusions about benefits early in recovery and in longer-standing cases, but the overall evidence base remains inconsistent and incompletely standardised.

If you or someone you know has experienced Bell's palsy, a condition causing sudden weakness or paralysis on one side of the face, you may have wondered whether facial exercises make a real difference to recovery. This review looked at a mix of newer research, including randomised trials, observational studies, and some smaller pilot studies, covering 854 people in total, to see what the evidence actually shows. The pattern that emerged was that better-designed studies, including the highest-quality trials, tended to report some benefit from facial exercise therapy, both soon after onset and in people with longer-lasting symptoms.

However, the studies differed so much in how they were designed and what they measured that researchers could not combine the results to get a more confident overall estimate. Several recent review articles on this topic were also judged to be of very low quality.

This means the overall picture is encouraging in places but still far from settled.

This is a summary of research, not medical advice. Talk to your own healthcare provider about anything affecting your care.

This review speaks to a recurring clinical question: does facial exercise therapy for Bell's palsy have a solid evidence base, and does timing or severity matter for who benefits? It updates an earlier Cochrane review by incorporating seven new randomised controlled trials, nine observational studies, and three quasi-experimental or pilot studies, totalling 854 participants, roughly three-quarters of which used validated outcome measures. The main signal is that all four trials rated high quality reported positive impacts, as did three of nine higher-quality observational studies, lending some support to facial exercise therapy both early after onset and in chronic cases. However, this should be read as a pattern across a heterogeneous and partly low-quality evidence base rather than a pooled effect: differences in study design meant no meta-analysis could be performed, so there is no single effect estimate to anchor clinical expectations.

Six newly identified review articles were all rated critically low quality using AMSTAR-2, meaning they add little independent weight. What this does not establish is a standardised protocol, optimal dosage, or clear comparative effectiveness against other interventions; the abstract does not report adverse event data or between-group statistical comparisons in detail. The findings inform clinical reasoning about facial exercise therapy's plausibility rather than confirming a specific treatment approach.