Switch to and enable Face Orientation (Overlay dropdown). Blue faces = outward normals (correct). Red faces = inverted normals (needs fixing).
: Efficiently creates "quads" to patch holes in the mesh by selecting opposite edges and bridging them, replacing messy "tris" with cleaner geometry. Scalpel Tool blender for dental crack patched
When your STL scan has gaps or artifacts, follow these steps using official Blender features or add-ons: Switch to and enable Face Orientation (Overlay dropdown)