Fig. 4

Complete eruption of incisor teeth 1–3 through the gingival surface in a 264-day-old Holstein fetus. In most cases, eruption of the incisor teeth is symmetrical in terms of sequence, eruption site and degree of eruption. Penetration of the gingiva starts at the lateral angle of the occlusal surface for incisors 1 and 2, and is more advanced laterally. Eruption of incisor 3 starts at the highest point of the occlusal surface, which is located at the centre (see Fig. 5b). The gingival mucosa still covers part of the enamel, as clearly identified by intense pink staining of the gingival border. Anterior part of the hemimandibles stained with D&C Red 33