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The definition of tooth mobility is the movement of a tooth in its socket resulting from an applied force.¹ Increase in tooth mobility is often a sign of periodontal breakdown and/or presence of excessive occlusal forces.¹ Tooth mobility is detected by using the ends of two instruments (eg, mirror handle) on either side of the tooth and alternately applying forces.² The most commonly used clinical index for tooth mobility is the Miller Index; using this index, mobility can be scored as the following^2,24:

 Class 0: Normal (physiologic) movement when force is applied. It has been defined as movement up to 0.2 mm horizontally and 0.02 mm axially.

 Class I: First distinguishable sign of movement greater than “normal” or “physiologic.”

 Class II: Movement of the crown up to 1 mm in any direction (buccolingual or mesiodistal).

 Class III: Movement of the crown more than 1 mm in any direction (buccolingual or mesiodistal) and/or vertical depression (apicocoronal) or rotation of the crown in its socket.