Neither of the two questions you asked can satisfy your satisfaction. The first porcelain tooth cannot be chosen at will, because the transverse neck is an absolute space. You can't choose a small tooth and leave a gap between each tooth. You can't even pull out four front teeth and insert six small teeth. Even if you can make the front teeth smaller and shorter, it is limited, but you have to take the nerve, or you will have endless troubles by grinding the long teeth short and exposing the nerve. Secondly, neither porcelain teeth nor orthodontics can change the shape of your mouth, because the vertical distance between your upper and lower jaws is determined by the contact of your posterior molars. It is impossible to shorten all your teeth, so you will destroy the enamel of all your teeth. The outstanding problems are difficult to change except surgery. Even if the front teeth are shorter and inclined inward, the improvement is limited, because the alveolar bone determines the protruding degree of the lips. In short, before making porcelain teeth, you can make two sets of plaster models, one set of original teeth and one set of simulated porcelain teeth. After comparison, reference and modification, you decide to make porcelain teeth when you are satisfied, otherwise you will regret it, because making porcelain teeth means grinding off natural teeth and wearing a porcelain crown, which requires shortening porcelain teeth and nerves, and will never restore natural teeth. There is no turning back. Be sure to make a careful decision.