Mandibular first premolars typically have two roots,a mesial and a distal.An anomaly is formation of a third auxiliary root.

Name: Mandibular first premolars typically have two roots,a mesial and a distal.An anomaly is formation of a third auxiliary root.
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Mandibular first premolars typically have one root.An anomaly is formation of two roots,one buccal and one lingual.In mandibular first premolars with two roots,a deep longitudinal groove separates the roots on the proximal sides.

Mandibular First Premolars Typically Have Two Roots,a Mesial and a Distal.An