**1. Introduction**

Bell's palsy (BP) is a common condition presented to physicians. It affects 23 people in every 100,000 yearly, and one in every 60–70 people will develop BP in their lifetime [1]. It is the most common acute facial lesion that unilaterally affects the facial nerve. It occurs when the facial nerve is swollen or compressed within the facial canal. The compromised facial nerve results in an array of symptoms, including temporary weakness or paralysis in the facial muscles, difficulty in mastication, loss of taste, drooping eyelid or corner of the mouth, drooling, poor closure of the eye, and pain in the auricular area. With an acute onset, the symptoms can develop within 72 hours and gradually resolve within weeks or months [2, 3]. However, around 30% of patients may not fully recover and experience residue dysfunction [2, 4].
