You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Ideal chin throat angle is: and explain in detail?
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