A “good” jawline is one that appears well-defined, with a clear angle where the jaw meets the neck and a chin that projects in proportion to the rest of the face. While personal taste varies, research on facial attractiveness points to specific angles, proportions, and features that consistently rate as appealing, and these differ between men and women.
Key Features of an Attractive Jawline
The jawline is shaped primarily by the mandible, the large U-shaped bone that forms your lower face. Three areas matter most for its appearance: the chin (how far forward it projects and how wide it is), the jaw angle (the corner where the jawbone turns upward toward your ear), and the body of the jaw connecting the two. A “good” jawline has clean transitions between these landmarks, with minimal excess soft tissue blurring the edges.
The gonial angle, the angle at the back corner of the jaw, is one of the most studied measurements in facial aesthetics. A survey published in the Journal of Oral and Maxillofacial Surgery found that the ideal female jaw angle in profile sits around 125.5 degrees, with the jaw corners positioned at about the level of the upper lip. The same study found that an intergonial-to-cheekbone width ratio of roughly 0.83 was considered most attractive, meaning the distance between your jaw angles should be about 83% of the width across your cheekbones. For men, a slightly sharper (smaller) gonial angle is generally preferred, giving a more squared-off appearance.
How Male and Female Jawlines Differ
Hormones during puberty create distinct jaw shapes in men and women. In males, a higher testosterone-to-estrogen ratio drives lateral growth of the cheekbones and mandible, forward growth of the brow ridges, and lengthening of the lower face. This produces a broader, more angular structure. In females, higher estrogen levels lead to a more delicate facial shape with softer jaw contours and fuller lips.
Research published in the Journal of Anatomy tracked these differences from childhood through adolescence and found that adult males end up with broader, more protruded, almost square chins, while adult females develop narrower, more rounded chins. The mandibular angle is also more prominent in males, and this distinction becomes increasingly apparent from the pre-teen years through the late teens. So what counts as an attractive jawline depends partly on sex: a wider, more angular jaw reads as masculine, while a softer, slightly rounder contour reads as feminine. Both can be equally “good” within their respective contexts.
Why Jawlines Signal Attractiveness
A strong jawline isn’t just an aesthetic preference pulled from nowhere. It functions as a biological signal. Because jaw growth during puberty is driven by sex hormones, a well-developed mandible essentially advertises healthy hormonal development. In men, a robust jaw suggests higher testosterone exposure during critical growth periods. In women, a more gracile jaw with fuller lips signals higher estrogen relative to testosterone, which researchers have linked to markers of reproductive health.
This is also why jawline definition tends to matter in perceived attractiveness. The jaw is one of the most sexually dimorphic parts of the human skeleton, meaning it’s one of the features that differs most between males and females. Your brain picks up on these cues quickly, even without conscious analysis.
Body Fat and Jawline Definition
Bone structure is only half the equation. Even a perfectly shaped mandible won’t look defined if it’s hidden under a layer of subcutaneous fat. The face stores fat in predictable areas, particularly under the chin and along the jawline, and this padding softens the visible contour. Most people carry between 20% and 25% body fat, and at those levels the jawline is partially obscured. Noticeable definition typically starts to appear as body fat drops below that range, with the sharpest definition visible around 10% to 15% in men and somewhat higher in women due to naturally higher essential fat levels.
This doesn’t mean you need extremely low body fat for an attractive jawline. A moderate reduction can make a significant difference in how defined your jaw appears, because the face is one of the first places where fat loss becomes visible.
How Aging Changes the Jawline
Your jawline doesn’t stay the same throughout your life. Facial bone aging involves progressive remodeling and selective bone resorption that reshape the skull over decades. The mandible is particularly affected: research analyzing 3D facial scans of people aged 25 to 75 found that the gonial angle increases by about 2.1 degrees per decade, while the height of the ascending jaw branch decreases by roughly 1.2 millimeters per decade. By the seventh decade of life, the mandibular angle has typically widened by 3 to 7 degrees compared to its youthful state.
This widening of the jaw angle, combined with loss of bone height, causes the jaw to rotate slightly backward and downward. The result is a less sharp angle at the jaw corner and a reduction in chin projection. Layer on age-related changes in the soft tissue, like skin laxity and fat redistribution that create jowls, and the cumulative effect is a less defined jawline. Men tend to show more pronounced angular bone changes, while women experience more remodeling of the jaw branch itself. These are normal structural shifts, not just “sagging skin,” and they explain why even lean older adults notice changes in their jaw contour.
Can You Improve Your Jawline?
Mewing and Exercises
Mewing, the practice of pressing your tongue against the roof of your mouth to supposedly reshape your jaw, has exploded on social media. The American Association of Orthodontists is blunt about it: there is no current research suggesting the technique provides any benefit to your jawline or oral health. Facial structure is determined by a complex interplay of genetics, bone growth, and muscle development. Simply changing your tongue’s resting position is not enough to reshape bone in adults, whose facial sutures have largely fused. The AAO does not recommend attempting to move teeth or align jaws without professional supervision.
Non-Surgical Options
For people whose jaw appears too wide due to enlarged chewing muscles (masseter hypertrophy, often from teeth grinding or clenching), neurotoxin injections can slim the lower face. The muscle gradually reduces in size after treatment, with maximum effect visible at about three months. Results last six to twelve months, and repeat sessions are needed to maintain the effect. This approach works specifically for muscle-driven width, not for bone structure.
Dermal fillers placed along the jawline and chin can also enhance definition, though results are temporary, typically lasting 12 to 18 months depending on the product.
Surgical Options
For permanent changes, two main procedures exist. Chin advancement surgery (genioplasty) involves cutting and repositioning the chin bone, allowing corrections in multiple directions: forward, backward, up, down, or side to side. It’s considered highly versatile, predictable, and stable, and it can also improve obstructive sleep apnea in some patients by pulling the chin forward and opening the airway.
Jaw angle implants are solid devices placed at the corners of the jaw to add width or vertical length. They’re effective for creating a wider, more angular appearance but carry risks including infection, bone erosion over time, and implant shifting. Unlike genioplasty, they offer no functional benefit. For complex cases involving both the chin and jaw angles, surgeons often combine approaches. The choice depends entirely on which part of the jawline needs enhancement and how much change is desired.
Facial Proportions That Tie It Together
A good jawline doesn’t exist in isolation. Research from the University of Toronto and the University of California found that facial attractiveness peaks at specific proportional relationships: when the distance from your eyes to your mouth is 36% of your total face length, and the distance between your pupils is 46% of your face width. These ratios match average human proportions, which suggests that faces closest to the population average tend to be perceived as most attractive. A strong jawline that’s wildly out of proportion with the rest of the face won’t necessarily look good. Harmony matters as much as any single feature.