Lower overall body fat
Maintain a consistent calorie deficit if overweight
Eat enough protein
Strength train regularly
Do cardiovascular exercise
Stay hydrated
Reduce sodium intake if bloated
Limit alcohol
Improve sleep quality
Practice good posture
Keep your tongue resting on the roof of your mouth
Avoid mouth breathing
Chew sugar-free gum moderately
Reduce neck and facial puffiness
Manage stress
Treat allergies or nasal congestion
Avoid smoking
Consider orthodontic evaluation if bite alignment is affecting jaw appearance
Consult a dermatologist or plastic surgeon for professional options if desired