Alabama G&F: Aging deer by tooth wear......2 1/2: Tooth 3 has two cusps (1 1/2 year old has 3 cusp). Tooth 4 has very little wear- that is dentine (dark area) is not as wide as the enamel (white area) that surrounds it. The posterior cusp of tooth 6 shows slight wear........3 1/2: The dentine of tooth 4 is as wide or wider than the enamel that surrounds it, not true of tooth 5. The cusp of tooth 6 shows definite wear and is almost flat.