Which class of tooth mobility ranges from 1-2mm in horizontal facial/lingual direction?

Tooth mobility is categorized into different classes based on the degree of movement in a horizontal direction. Class II mobility specifically refers to a tooth that has 1-2 mm of horizontal movement in the facial/lingual direction. This indicates that the periodontal support around the tooth is compromised to a degree where it can move slightly but is not excessively loose.

Understanding the classification helps dental professionals assess periodontal health and determine appropriate treatment plans. Class I would indicate minimal movement (less than 1 mm), Class III indicates severe mobility (greater than 2 mm or vertical movement), and Class IV mobility suggests a very loose tooth that may be imminently lost. Thus, Class II accurately describes the specified range of mobility for the given question.