Smooth Tool On Mirrored Geometry


Is there a way to lock verts on the line of symmetry so that when using something like the smooth tool around those verts won’t create an unwanted gaping whole in the model?

It is one aspect of modeling with mirrored symmetry that always ends up being a put off since by doing this it makes the modeling behavior not act like you are working on one solid model.

If not it would be nice if there was a feature to help with that.