The mandibular central incisor is the tooth located on the jaw, adjacent to the midline of the face.

As with all incisors, its function includes shearing or cutting food during mastication, commonly known as chewing.

In the universal system of notation, the deciduous mandibular central incisors are designated by a letter written in uppercase.

In the universal system of notation, the permanent mandibular central incisors are designated by a number.

The international notation has a different numbering system than the previous two, and the right permanent mandibular central incisor is known as "41", and the left one is known as "31".