Final answer:
The phrase 'dot in the slot and the white toward me' ensures that the film is correctly positioned in the mouth.
Step-by-step explanation:
The phrase 'dot in the slot and the white toward me' ensures that the film is correctly positioned in the mouth. This phrase is commonly used in dental X-rays to help the patient and the technician align the film properly. The 'dot' refers to a marker on the film, which should be placed in a particular spot in the patient's mouth. The 'slot' refers to the film holder, which should be inserted in a specific orientation. The phrase also helps ensure that the film is positioned with the white side facing toward the technician for proper exposure.