Developmental depressions on both mesial and distal sides of roots are seen in:

Deep concavities on distal surface are present in – Maxillary 1st premolar Deep concavities on distal surface are present in – Maxillary 1st molar Developmental depressions on both mesial and distal sides of roots are seen in – Mandibular central incisors, upper canines, mesial root of mandibular 1st molar.