After a chinplasty the feeling in the lower lip and chin is always disturbed. If the mental nerve (that comes out of the jawbone just behind the chin and then runs into the lower lip and skin of the chin) has not been ruptured during the surgery, for sure sensitivity will come back. It is not possible however to predict when and to which extent. Mostly the recovery will take between several weeks and several months but it can take up to even 2 years. It is normal that sensitivity of lower lip and chin doesn’t recover completely.
If the mental nerve has been ruptured (in the hands of Dr Bart van de Ven around 1%) it can be sutured. Of course the prognosis will then be worse. Damage to the mental nerve will however not be visible to the outside world as it is a 100% sensory nerve. It doesn’t contain motor branches so function of any muscle is not involved.