Final answer:
On periapical radiographs, two soft tissue shadows that are often seen are the infraorbital foramen and the mental foramen.
Step-by-step explanation:
On periapical radiographs, two soft tissue shadows that are often seen are the infraorbital foramen and the mental foramen. The infraorbital foramen is located on the anterior maxilla just below the orbit and serves as the exit site for a sensory nerve that supplies the nose, upper lip, and anterior cheek. The mental foramen, on the other hand, is located on the anterior-lateral side of the mandible and is the exit site for a sensory nerve that supplies the chin.