The present invention relates to a method for segmenting a digital tooth model (4) containing a three-dimensional triangular mesh (41), in which an automated device (6) can perform the following steps called initial steps:-Classify in the grid (41) into at least one concave-shaped triangle and/or at least one convex-shaped triangle, and-in the grid (41), identify at least one tooth area containing triangles, for example, Each triangle in the area has at least one adjacent triangle in the area, wherein all the triangles in the area are not concave or convex.本發明係關於一種包含三維三角網格（41）之數位牙齒模型（4）分割方法，其中自動化裝置（6）可以執行被稱為初始步驟之以下步驟：- 在網格（41）內進行分類，分為至少一個凹形類三角形及/或至少一個凸形類三角形，並且- 在網格（41）內，識別至少一個包含三角形之牙齒區域，例如在該區域中之每個三角形均具有至少一個在此區域內之相鄰三角形，其中該區域中之所有三角形均不為凹形或凸形類。
