Final answer:
When the PID is not positioned close to the patient's face, a foreshortened film will result.
Step-by-step explanation:
When the PID, or position indicating device, is not positioned so that it almost touches the patient's face, a foreshortened film will result. This means that the image will appear shortened or compressed, making it difficult to accurately assess the dental structures.
For example, if the PID is not placed close enough to the patient's face during an X-ray, the resulting image may show a distorted perspective, making it harder for the dentist to diagnose any dental issues.
To obtain a high-quality dental X-ray, it is important for the dentist or technician to position the PID properly, ensuring it is almost touching the patient's face.