Most lower second molars, the large chewing teeth just behind the first molars, are anchored in the jaw by two roots. A patient described in a 2026 case report had four roots in that tooth, and 3D imaging showed the same arrangement in the matching tooth on the other side of the jaw.
The report, by researchers at Pomeranian Medical University in Szczecin, Poland, and the University of Münster in Germany, was published Feb. 18 in Case Reports in Dentistry. The authors say four-rooted lower second molars on both sides are, to their knowledge, extremely rare in the medical literature.
