The smallest and most inaccessible root canal-in the maxillary second molar is the distobuccal

Sometimes, mineralization of dentin begins in small globular areas that fail to coalesce into a homogenous mass. This results in zones of hypomineralization between the globules.
These zones are known as globular dentin or interglobular spaces. Thus, demonstrating defect of mineralization and not of matrix formation, the dentinal tubules pass uninterruptedly through interglobular dentin.

The average overall length of the permanent maxillary central incisor is 22.5 mm

The largest and longest root canal of the maxillary second molar is the lingual

Maxillary lateral incisor agenesis:
This is the most common congenital absence of a permanent tooth in the maxillary anterior region, accounting for about 20% of all dental anomalies.

Coronal developmental invagination (DI):This is a common anomaly in the permanent maxillary lateral incisor, usually appearing as an accentuation of the lingual pit.It's often bilateral.

Peg-shaped crown:This is a common alteration in the maxillary lateral incisor.