Tooth Mobility Index
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Stage 0 (M0):
Physiologic mobility up to 0.2 mm.
Stage 1 (M1):
The mobility is increased in any direction other than axial over a distance of more than 0.2 mm and up to 0.5 mm.
Stage 2 (M2):
The mobility is increased in any direction other than axial over a distance of more than 0.5 mm and up to 1.0 mm.
Stage 3 (M3):
The mobility is increased in any direction than axial over a distance exceeding 1.0 mm or any axial movement.