Ideal chin throat angle is:

Neck–chin–angle Cervicomental angle should be approximately 90 degrees. The angle is more obtuse in females as compared to males. The soft tissues sag in older individuals and contributes to less than ideal submental form. Lip–chin–throat angle The angle between the lower lip and deepest point along the neck chin contour should be approximately 90 degrees. An obtuse angle is unaesthetic and more so as the angle increases. This often reflects: Chin deficiency Retropositioned mandible Lower lip procumbency Excessive submental fat Low hyoid bone position