hello everyone, i’m kinda new here and looking for the help.
i sculpted hd model, but now my client want an open mouth. before it wasn’t needed. 
i have 7 sub levels, i tried go to the lowest, mask polys where the mouth is and hide them, after i DelHidden, but Reconstruct Subdivs loose my highest level of details. are there any workarounds how to make a mouth?
thanks!