If a first molar is lost, the second molar drifts to the:

 # If a first molar is lost, the second molar drifts to the:

A. Distal

B. Mesial 

C. Buccal

D. Lingual

The correct answer is B. Mesial.

When a first permanent molar is lost during childhood or adolescence and not replaced, the second molar drifts mesially and the premolars often tip distally and rotate as space opens between them. 

Ref: Contemporary Orthodontics, Fourth Edition, Page 639.

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