It almost looks like a shading issue for the faces.
View your mesh in blender View mode without the texture. Do the faces look unevenly shaded? If so select the entire Mesh. Now go to the Mesh tab > Normals > Reset Vectors. This will set the orientation of the vertices/faces/edges to be better aligned. It may fix your shading issues.
I appreciate your help. Unfortunately, after attempting that fix, the issue remains.
It does feel like I am getting closer to solving the issue though. After messing around with some things, I was able to get the weirdly textured spot on the horn of the mesh to be fixed, but still not the teeth.
Do you have any extra vertices and the edges of the faces aren’t aligning to the same edges (for shading)?
Select the teeth area faces, go to the Mesh tab in Edit mode > Clean Up > Merge Vertices. The toolbar at the bottom of the screen will tell you if Blender has taken separate vertices at the same point and merged them together.
Another issue I’ve had with complex shapes is that the alignment of the vertex orientation. It usually shows up as a sharp edge between 2 faces that affect the shading.
I don’t know if there’s another fix for it, but I select all the faces around the area I’m having issues with and go to the Mesh Tab > Normals ? Smooth Vectors, then while they are still selected go to Mesh > Normals > Reset Vectors. This seems to get rid of shading issues caused when you have an internal group of faces that you’ve manually created from outer loops of vertices. It seems to force the normal orientation of vertices to different places depending on how you create those internal faces.