<prompt> Developmental depressions on both mesial and distal sides of roots are seen in:Mandibular central incisorMaxillary caninesMesial root of mandibular 1st molarAll of the above  <response>: Deep concavities on distal surface are present in Maxillary 1st premolarDeep concavities on distal surface are present in Maxillary 1st molarDevelopmental depressions on both mesial and distal sides of roots are seen in Mandibular central incisors, upper canines, mesial root of mandibular 1st molar. 