I want to cut teeth in such way that the edge of the model will be in the middle.

A tooth will have to cut out some of the model material and add material in another place on the face.

So a tooth is not cut in to the model or added to the model. It is both cut and added.

What is the most appropriate way to do this?

I get a lot of error messages and when I try to make teeth follow a curve they wander away from the arch surface for some reason.

Thank you.