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Updated: Feb 25, 2026

Ultrasound-guided Botulinum Toxin-A Injections: A Method of Treating Sialorrhea
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Modification of Chin Projection and Aesthetics With OnabotulinumtoxinA Injection.

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OnabotulinumtoxinA effectively improves chin aesthetics by altering the pogonion

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Area of Science:

  • Facial Plastic Surgery
  • Aesthetic Medicine
  • Cosmetic Dermatology

Background:

  • Chin projection and aesthetics are influenced by bony structure and mentalis muscle activity.
  • A hyperactive, high-riding mentalis muscle can lead to a blunted chin contour in some patients.
  • Understanding soft-tissue dynamics is crucial for effective chin augmentation.

Purpose of the Study:

  • To evaluate the efficacy of onabotulinumtoxinA (botulinum toxin A) in enhancing chin aesthetics.
  • To assess improvements in patients with underprojected chins and hyperactive mentalis muscles.
  • To analyze changes in pogonion position and overall chin contour post-treatment.

Main Methods:

  • A case series of 11 patients with underprojected chins and hyperactive mentalis muscles.
  • Photographic analysis of pogonion position (vertical and horizontal) before and after treatment.
  • Injection of 12-15 units of onabotulinumtoxinA into the mentalis muscle.

Main Results:

  • Significant inferior displacement of the pogonion in 10 of 11 patients (P=.005).
  • Improved chin contour with a more rounded, less blunted appearance.
  • All patients reported improved aesthetics and decreased chin tension, with no adverse effects.

Conclusions:

  • OnabotulinumtoxinA effectively improves chin aesthetics by repositioning the pogonion.
  • This nonsurgical approach offers measurable changes in chin projection and contour.
  • It can be used independently or as an adjunct to traditional chin augmentation procedures.