Where Can Botox Be Injected? Guide to Forehead, Crow’s Feet, and Masseter Botox
By transiently relaxing hyperdynamic facial muscles to soften wrinkles, botulinum toxin is injected into the frontalis, glabella, orbicularis oculi, and masseters.
Key points
- Upper Facial Architecture: Horizontal forehead lines, glabellar frown lines, and lateral periorbital crow's feet represent the primary aesthetic targets.
- Masseter Neuromodulation: Relieves nocturnal bruxism and temporomandibular joint pain while contouring hypertrophic jawlines into a softer V-line.
- Onset and Longevity: A 10-minute in-office procedure; neuro-relaxation starts on days 3–4, matures by day 14, and persists predictably for 4 to 6 months.
Neuromuscular Mechanism and Anatomical Targets
Botulinum toxin Type A selectively cleaves SNAP-25, a critical SNARE protein, inhibiting the presynaptic exocytosis of acetylcholine at neuromuscular junctions. By transiently moderating muscle contractility, overlying dermal pleating ceases, halting the progression of dynamic rhytids into fixed dermal fractures. Core therapeutic zones include: horizontal frontalis lines, glabellar complex (corrugator/procerus), lateral canthal crow's feet (orbicularis oculi), nasal bunny lines, excessive gingival display (gummy smile), and masseteric hypertrophy.
Post-Injection Care and Precautions
To avert inadvertent drug diffusion into adjacent non-target muscles, patients must remain strictly upright for 4 to 6 hours, avoiding lying supine or bending downward. Never rub or massage injection portals. Rigorously abstain from strenuous exercise, saunas, hot showers, and alcohol for 24 hours. Failure to follow these rules may precipitate toxin migration into the levator palpebrae superioris, provoking transient blepharoptosis.
References
- Carruthers A, Carruthers J. Botulinum toxin type A in facial aesthetic medicine. Dermatol Clin. 2004;22(2):125-133.
- Smyth AG. Botulinum toxin in the treatment of masseteric hypertrophy and bruxism. Br J Oral Maxillofac Surg. 1994;32(4):254-256.
- American Society for Dermatologic Surgery (ASDS). Guidelines for Botulinum Toxin Injections; 2022.