Method for segmenting a digital model (4) of teeth comprising a three-dimensional triangular mesh (41), wherein automatic means (6) implement the following steps, which are referred to as initial steps:



classifying, within the mesh (41), at least one triangle into a concave category and/or at least one triangle into a convex category, and
identifying, within the mesh (41), at least one tooth region comprising triangles such that each triangle of the region has at least one neighbouring triangle in the region, all the triangles of the region belonging to neither the convex nor the concave category.