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

From the mesial and distal aspect both the buccal and lingual cusps are visible
A well developed mesial marginal ridge and a mesial marginal developmental groove is present
In the middle of the mesial surface is the mesial developmental depression which continues beyond the cervical line