To fix sharp edges or problematic triangles in 3D models, use mesh editing tools to smooth edges, merge close vertices, or remesh the area for even triangle density.
Sharp edges between triangles create a faceted look—smoothing softens them; sliver triangles (long, thin) cause rendering/printing errors—merging vertices or remeshing evens out density. This helps with game performance (clean meshes), 3D printing (avoids weak parts), and digital art (smooth surfaces).
In Blender, try the "Smooth" tool on edges or "Merge by Distance" for close vertices; for persistent issues, use the "Remesh" modifier to redistribute triangles evenly.