These are converging nicely, you just have to use smaller elements. In Mechanical, I would put an element Sizing mesh control on the tooth edge, while leaving the default element size constant. Then the elements along the front face edge can be small without incurring a large number of total nodes, since you don't need small elements on the back face, bottom face and top face of the tooth.
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New Post - Reply To: Stresses are not converging (but nodal displacements are?)