1. Ensure the accuracy of mold taking: When taking dental molds, dentists need to ensure that accurate oral structures and dental impressions are obtained. By touching the lips gently, the dentist can feel the geometric shapes and changes of teeth and oral cavity, thus helping to guide the mold taking process and ensure accurate impression results.
2. Improve the patient's comfort: Oral demoulding usually requires putting the demoulding material in the mouth, which may cause some discomfort or reflex action. By touching the lips, the dentist can distract the patient's attention, reduce discomfort and make the patient more comfortable and relaxed.
Please note that the specific practice of each dentist in the process of taking the mold may be slightly different, depending on personal skills and preferences. It is important to communicate with the dentist to understand the detailed steps of the operation process and relieve any worries or doubts.