Published on March 11, 2021, Updated on March 11, 2021
Labial. The side of a tooth that is adjacent to (or the direction toward) the inside of the lip (labium), as opposed to lingual or palatal (both oral), which refer to the side of a tooth adjacent to (or the direction toward) the tongue or palate, respectively, of the oral cavity.
Source: https://en.wikipedia.org/wiki/Glossary_of_dentistry