| A: Cusp tips are calcified but without fusion. |
| B: Calcified cusps are united so the occlusal surface is recognizable. |
| C: 1) Enamel formation has been completed at the occlusal surface. 2) Dentine formation has commenced. 3) The pulp chamber is curved. |
| D: 1) Crown formation has been completed to the level of the amelocemental junction. 2) The pulp chamber in the uniradicular teethhas a curved form. In the molars the pulp chamber has a trapezoid form. 3) Root formation has commenced. |
| E: 1) The walls of the pulp chamber are straight and the pulp horns have become more differentiated. In molars, the radicular bifurcation has commenced to calcify. 2) The root length is less than the crown height. |
| F: 1) The walls of the pulp chamber now form an isosceles triangle. In molars, the bifurcation has developed sufficiently to give the roots a distinct form with a funnel shaped endings. 2) The root length is equal to or greater than the crown height. |
| G: The walls of the root canal are parallel and its apical end is still partially open. |
| H: 1) The root apex is completely closed. 2) The periodontal membrane surrounding the root and apex is uniform in width throughout. |