Needle in orofacial harmonization: types and use

In orofacial harmonization, the needle is the sharp-tipped instrument used to inject botulinum toxin, dermal fillers and other injectables. It is also used to open the entry point when the professional works with a cannula.

Needles are described by gauge (G) and by length. The higher the gauge number, the thinner the needle. Very fine needles are typical of botulinum toxin, where small volumes are distributed across several points; for fillers, the gauge usually follows the viscosity of the product, and many manufacturers already supply the recommended needle with the syringe.

When is the needle usually preferred?

The needle offers precision of placement. That is why it is common in targeted injections, such as toxin in the glabella, lip contouring and support deposits on bony structures, such as the chin and cheekbone. Each puncture is an injection point, and multiple punctures tend to raise the chance of bruising and swelling.

What about vascular risk?

Because of its sharp tip, the needle enters a vessel more easily than the cannula. That does not mean the cannula is safe by definition: the risk of vascular occlusion exists with both instruments and depends greatly on the area, the plane and the technique. Knowing the vascular anatomy of each zone and keeping hyaluronidase available when hyaluronic acid is injected are precautions that apply to any choice.

The choice between needle and cannula is the decision of the qualified professional, according to the assessment and the rules of their professional council in Brazil.