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DAO Botox (targeting the depressor anguli oris muscle) is a precise lower-face toxin technique to soften a down-turned mouth, reduce the appearance of sadness/anger at rest, and subtly elevate oral commissures. This guide covers assessment, injection mapping, safe dosage ranges, complication avoidance, aftercare, and review strategy—optimised for clinicians seeking confident, natural outcomes.
In lower-face rejuvenation, the DAO muscle plays a critical role in how patients are perceived emotionally at rest. When overactive, it creates a consistent downward pull on the oral commissures, contributing to a “sad” or fatigued expression—even in neutral positioning.
For clinicians transitioning into aesthetics, understanding this dynamic is not just anatomy—it’s expression analysis. The balance between depressor and elevator muscles determines lower-face harmony, and the DAO Botox approach is often the first step in correcting this imbalance.
However, successful outcomes depend on more than just injection technique. It requires structured anatomical understanding, dosing discipline, and patient selection—all of which are covered in depth inside the Dr. Dray Academy aesthetic training pathway designed for medical professionals entering facial aesthetics.
When performed correctly, DAO Botox and complementary filler techniques can significantly improve lower-face expression, restoring a more neutral or uplifted resting appearance.
Clinical benefits of DAO Botox
At Dr Dray Academy, our training is designed to go beyond basic techniques — focusing on the clinical judgement, precision, and full-face understanding required to deliver natural, high-level results.
Our approach is built on over 45 years of experience treating some of the world’s most discerning patients, and these techniques are practiced daily across our London, Paris, and Abu Dhabi clinics.
Accurate treatment of the DAO muscle begins with structured assessment rather than injection itself. In clinical practice, poor outcomes are rarely technique-based—they are assessment-based.
The DAO originates from the mandible and inserts into the modiolus, interacting closely with the platysma, depressor labii inferioris, and zygomaticus muscles. This interdependence is what makes lower-face treatment highly technique-sensitive.
Key clinical considerations:
From a training perspective, this is why Dr. Dray Academy emphasises structured facial mapping before any injection is performed.
DAO Botox is an off-label application of botulinum toxin type A used to reduce downward pull at the oral commissures.
When injected correctly, the goal is not immobilisation—it is balance restoration between depressor and elevator muscles.
In practice:
A common clinical mistake is overtreatment, which can lead to functional asymmetry. This is why conservative dosing is strongly emphasised in early practice stages.
Ideal candidates for DAO Botox are healthy adults with mild-to-moderate down-turning primarily due to muscle over-pull. Patients with significant skin laxity or deep volume loss may require combination therapy (dermal fillers near the marionette/ prejowl/ skeletal support or skin boosters for dermal quality).
The DAO is a triangular muscle with a broad base inferiorly and insertion at the mouth corner. It lies medial to the masseter, lateral to the depressor labii inferioris (DLI), and superficial to perioral SMAS layers. Anatomical diligence is critical to avoid DLI diffusion (lower-lip dysfunction) and smile asymmetry.
Goal: weaken DAO pull while preserving natural lip function. Use conservative dosing initially, with review and micro-adjustment.
Combine DAO Botox for best outcomes
For perioral rejuvenation, consider pairing DAO Botox with:
A preview into the DAO Botox module taught during the Aesthetics Mastery Pathway by Dr Dray Academy
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