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

In the universal system of notation, the permanent mandibular first molars are designated by a number.

The Palmer notation uses a number in conjunction with a symbol designating in which quadrant the tooth is found.

The international notation has a different numbering system than the previous two, and the right permanent mandibular first molar is known as "46", and the left one is known as "36".

The first molar is usually the first permanent tooth to erupt at 6–7 years and has adult undertones.

Listed in order of decreasing height they are: ML, DL, DB, MB, and D. An eighth cusp was found in a primary second lower molar in an Argentinean child.

The heights of contour on the mesial and distal contact the adjacent teeth and are located at the junction of the occlusal and middle thirds of the crown.

The mesial view shows a slight tipping of the crown to the lingual.