“…Smile reconstruction with a contralateral facial nerve‐driven free functional muscle transfer using a cross‐face nerve graft may result in less movement in the transferred muscle than on the healthy side. Movement synchronization with the contralateral orbicularis oculi or orbicularis oris muscle contraction may also occur(Hembd et al, 2017; Manktelow et al, 2006; Miller et al, 2021). Therefore, the selection of the optimal facial nerve branch is critical; however, electrostimulation during surgery may not always identify the optimal components that exclusively control levator muscle groups, including the zygomaticus major, zygomaticus minor, levator labii superioris, and levator anguli oris muscles.…”