In this case, the impact will not have much impact.

Whether you have a mouth or not has little effect on facial binding, but if your facial movements have the action of opening your mouth, you may wear it when making animation. Also, the mouth should be separated, not together, otherwise it will affect the animation of the mouth.

In fact, a simple mouth is not too difficult, that is, the mouth is squeezed on the head and squeezed into the shape of a mouth.

The model's mouth is not easy to wear, and the characters will see the tongue when they speak, so the mouth should be necessary. You can make a simple mouth instead.

Otherwise, facial binding requires animation, so it is necessary to have a mouth. If your animation has no mouth movements, then you can't do anything. However, when doing projects or animations in the future, this mouth will still be met. Choose this yourself.

If necessary, you can watch the following video (if you are on a computer, you can watch it).

v.youku.com/v_show/id_XNTg2MzkwMjky.html

Www.tudou.com/programs/view/z46Zvlkp8VI/,, please try it first. I hope I can help you.