The face refers to the area from the forehead to the chin, and among these areas, the forehead occupies a larger share than many people expect.
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The face is broadly divided into upper, middle, and lower sections from top to bottom. The area from the hairline to the eyebrows is called the upper face, from the eyebrows to the tip of the nose the midface, and from the tip of the nose to the chin the lower face.

The proportions of the upper, middle, and lower face (Reference: Channel A, I Am a Body God.)
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'Conditions for a youthful face'
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In general, the upper, middle, and lower facial proportions are considered standard at 1:1:1, but the youthful face that is receiving more attention these days is said to have a 1:1:0.8 ratio.

Upper, middle, and lower facial ratio of a youthful face, 1:1:0.8 (Reference: SBS Running Man)
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When people usually talk about a pretty face, they mainly refer to the midface where the eyes and nose are located. However, if you consider the overall balance of the face, the forehead plays a very important role.
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And when you look at the faces of young children, regardless of ethnicity, you can see a round forehead without contour, which clearly shows the importance of the forehead in a youthful appearance.

Comparison between a young child’s face and an adult face. Conditions for a youthful face
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If the forehead is not attractive, there are also many limitations on hairstyles, and more people than expected choose to wear bangs to cover their forehead at all times.
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Forehead contour caused by supraorbital bossing and a recessed forehead
Supraorbital bossing, also called brow-bone prominence, refers to the protrusion of the area where the orbital bone connects to the forehead. The more pronounced the supraorbital bossing is, the more masculine and stronger the impression becomes.
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And the protruding supraorbital bossing can create contours in the forehead and also make the forehead angle appear to slope backward.
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The more the forehead angles backward, the more masculine the impression becomes.
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'How forehead contouring is done'
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A feminine, rounded forehead should have minimal visible supraorbital bossing, no contour irregularities, and a forehead angle that does not slope backward.
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The representative methods of forehead contouring are forehead implants, forehead fillers, and forehead fat grafting.
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These three methods each have their own advantages and disadvantages.
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The forehead contouring method recommended by medical professionals may vary, but the safest and most natural method is forehead fat grafting.

Fat grafting to the forehead and temples for a feminine, youthful forehead
The area above the cheekbones is called the temple area, and this is also an area where contours are likely to appear.
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When performing fat grafting to the forehead, the temple area is usually grafted at the same time.
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The hollow parts of the temples should be filled in well, and the transition where they connect to the forehead should be made smooth.
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In the forehead area, the surgeon must carefully graft an appropriate amount of fat while considering forehead contours such as supraorbital bossing and the forehead’s backward slope.
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Before-and-after comparison, one month after forehead fat grafting
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Fat grafted into the face usually goes through a one-month engraftment period, during which some is absorbed and some remains after taking hold. One advantage of engrafted fat is that it can last semi-permanently.
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'Areas for facial fat grafting'
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When performing fat grafting on the face, it is usually also transplanted not only to the forehead and temples, but also to areas such as the front cheeks, nasolabial folds, outer cheeks, chin, aegyo-sal, and eyelids—basically to hollow areas of the face or areas where more volume is needed. Rather than aiming for overly dramatic results, it is much better to create a natural result.
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And for fat grafting aimed at youthful facial rejuvenation or middle-aged facial rejuvenation, it is important to identify the hollow contours of the face and the areas where subcutaneous fat has decreased, and then graft accordingly.
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This is a real model who consented to publication. Review of forehead fat grafting