Mesiolingual developmental groove is seen in
Maxillary 1st premolar
Mandibular lateral incisor
Maxillary lateral incisor
Mandibular 1st premolar
Mesial Aspect

 Lingual cusp is around two third the size of the buccal cusp
 Extreme lingual slope is seen at the mesial marginal ridge
 Between the mesial marginal ridge and the mesiolingual cusp ridge is the mesiolingual developmental groove
 Mesial contact area is in the middle third