Incisors (front teeth) act as wedges in the human body. Which change would increase the mechanical advantage of incisors? a decrease in the distance of the teeth from the fulcrum an increase in the distance of the teeth from the fulcrum an increase in the thickness at the widest part of the teeth and no change in the length of the teeth an increase in the length of the teeth and no change in the thickness at the widest part of the teeth.