1. Method for producing a growth forecast or treatment simulation for the head of a patient, the method comprising the steps of: (a) obtaining a hard tissue and soft tissue image representing the hard tissue structure and soft tissue structure of the head of the patient; (b) identifying a set of pre-defined hard tissue points on the hard tissue image where the position of a set of soft tissue points on the soft tissue image is known relative the position of the set of pre-defined hard tissue points; (c) manipulating the position of at least one of the set of pre-defined hard tissue points; (d) determining the set of soft tissue points based on the set of pre-defined hard tissue points after the manipulation of the position of the at least one of the set of pre-defined hard tissue points; and (e) generating a soft tissue tracing representing the soft tissue structure of the patient by generating a series of Bezier curves having the set of determined soft tissue points as anchor points, (f) wherein the soft tissue tracing formed from the series of Bezier curves represents the growth forecast or the treatment simulation of the head of the patient based on the manipulation of the position of the at least one of the set of pre-defined hard tissue points.