Notation
- Deciduous mandibular central incisors are designated by uppercase letters in the universal system of notation.
- The right deciduous mandibular central incisor is known as P.
- The left deciduous mandibular central incisor is known as O.
- In the international notation, the right deciduous mandibular central incisor is known as 81.
- The left deciduous mandibular central incisor is known as 71.
- In the universal system of notation, permanent mandibular central incisors are designated by numbers.
- The right permanent mandibular central incisor is known as 25.
- The left permanent mandibular central incisor is known as 24.
- In the Palmer notation, a number is used in conjunction with a symbol designating the quadrant.
- Both central incisors have the number 1, but the right one has the symbol ┐, while the left one has ┌.
- In the international notation, the right permanent mandibular central incisor is known as 41, and the left one is known as 31.

Anatomy
- The central incisors have fossa on their lingual surfaces.
- The mesial and distal proximal contacts are located in the incisal third.
- The facial and lingual heights of contour are in the cervical third.
- This is consistent with all incisors and canines.
- The central incisors do not have cusps.

Appearance and Function
- The mandibular central incisor is located on the jaw, adjacent to the midline of the face.
- Its function includes shearing or cutting food during mastication.
- The tooth does not have cusps but has an incisal ridge or incisal edge.
- The deciduous mandibular central incisor has incisal ridges that give it a serrated appearance.
- The permanent mandibular central incisors are usually the first teeth to appear in the mouth, around 6-8 months of age.

References
- Ash, Major M. and Stanley J. Nelson, 2003.
- Wheelers Dental Anatomy, Physiology, and Occlusion.
- 8th edition.