The floor of the mouth should be examined by bimanual palpation. This is performed by placing one finger under the tongue and another finger under the chin to assess any thickening or masses. Whenever palpating in a patient's mouth, the examiner should hold the patient's cheeks, as shown in Figure 12-31. This is done as a precaution in case the patient suddenly tries to speak or bite down on the examiner's finger. The examiner's right index finger is placed under the tongue;the left thumb and third finger are pushing the patient's cheeks inward to prevent biting;and the left index finger palpates under the patient's chin.
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