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In page Smile surgery:

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In more long standing acquired facial paralysis either a CFNG procedure or "babysitter" procedure are the indicated techniques, with or without a free muscle transfer.(Algorithm 1)[1] Secondary facial paralysis with a denervation time of less than 6 months can be treated with one or more cross facial nerve grafts (CFNGs).[1] During a cross facial nerve graft procedure one or more branches of the non-paralysed facial nerve are divided and connected to one or more sural nerve grafts which are tunnelled to the affected side of the face. Whether these nerve grafts are immediately attached to the paralysed facial nerve branches or after 9 to 12 months depends on the chosen procedure.[citation needed]