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Why is my CFD so bad?
Your CFD isn't so bad. It is a very common form where the face doesn't grow downward and outward. You lack vertical height. You appear brachyfacial aka Class 2 Div 2 maybe? Do you bite with mostly your molars? Your face looks very short. Your issue isn't that your face is downward grown, rather that your maxilla looks like it stayed up there. Do you hold your teeth together or apart? It also seems you lack width. What is your Mew line? Like high 30s low 40s?
Is my face missing forward growth?
I was class 2 division 2 but now I am class 1 because the orthodontist done rubber band and braces treatment. I always chew with molars and rested teeth in contact while I was growing up but now I keep them apart with mewing. My IMW is 33mm but I have never measured my mew line. My upper teeth dont show when I open my mouth unless I smile.
I'm no expert when it comes to analyzing faces, but whenever I see a lot of extra skin and soft tissue under the chin with people who are not overweight, it occurs to me that they have a very poor swallow function and the back of the tongue is resting low in the mouth. Really work on getting the back posterior third of your tongue up into your soft palate, lift your hyoid bone up, and focus on correcting your swallow function. This should help to improve your appearance going forward.
Edit: Overall body posture and lots of chin tucking exercise is also key.
Do you recommend teeth together or apart?
The best place for the mandible is where the tongue can cover the entire palate and isn't restricted by other obstructions. This may mean teeth apart for some people.
Also, those with malocclusion should probably not keep their teeth together since the forces would not be delivered evenly.