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There is no limit to the number of vetices or faces that a shape can have.
There are at least three faces at a vertex of a dodecahedron, and at most eleven.
Each of them has four triangular faces.
The comparative is "more serious". The superlative is "most serious".
Since you use the term "faces" of a shape, you may be referring to polyhedra,which are three dimensional solids. There is no maximum number of faces a polyhedron can have. But for regular polyhedra (a special case where all faces are congruent regular polygons), the regular polyhedron with the most faces is the icosahedron, which has 20 faces, each of them an equilateral triangle. The most familiar regular polyhedron is the cube which has six square faces.