A concave molding is a type of architectural feature that is used to create decorative edges and curves. It is often used in doorways, windows, and other openings. The two most common types of concave moldings are OGEE and TEE. An OGEE is a curved molding with an S-shaped profile, while a TEE is a curved molding with a T-shaped profile. Both of these moldings can be used to add visual interest to any space.