supplementary grooves, on the occlusal surface, is described as being M-shaped. The mandibular first molars are the most common carious teeth and the most common teeth to undergo endodontic treatment or extraction. Up to 45% of all extracted teeth are mandibular first molars.

References

* Ash, Major M. and Stanley J. Nelson, 2003. Wheeler's Dental Anatomy, Physiology, and Occlusion. 8th edition.
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