The Botulinum toxin type A is a known substance and widely used in medicine since 1978 (ophthalmology, neurology) and since 1992 in medicine and cosmetic surgery. This substance injected into the muscle acts on the point of contact between nerve and muscle (neuromuscular plate) reducing and / or blocking the muscle contraction. Then, after about 4-6 months, the plaque develops new neuromuscular synapses (connections) and the muscle begins to contract (see diagram). On the face is used to reduce until it stops, depending on the dose used, the contraction of facial muscles and thus to eliminate the so-called "expression lines."
Very important for a natural result is studying the facial expressions of the individual patient, the force of the muscle contraction and any other asymmetries. Based on this it will mark the points where to inject the toxin, choosing the quantity and the concentration. The next step will be to inject a few drops of product on the muscle target points , and after about 3-4 days, they will begin to appear the first effects and will be well established after 8-10 days.
Attenuation or elimination of frontal wrinkles and those annoying wrinkles between the eyebrows (glabellar wrinkles): we can actually get a lifting effect of the 3rd top of the face. Also you can smooth out wrinkles around the eyes and have an opening of the look.
Contrary to the woman, the man's eyebrows is parallel to the arch of the eyebrow bone. So the Botox must never result in the raising of the tail of the eyebrow, so-called gull-wing, as it does in women
The results usually last six months; it was noticed that after several treatments the effect of smoothing lasts longer.
Side effects are mainly related to the used technique and then to the operator's skill. One effect is to avoid the so-called "Mephistophelian " appearance that is the central buckle of the eyebrows.
Unnatural Mephistophelian appearance
However, the most feared side effect is the lowering of the upper eyelid that can occur due to slipping of the toxin to the levator muscle of the eyelid when it is injected in the corrugator muscles located between the two eyebrows.
Clearly this is a reversible effect , but it can last a few months.
Other side effects, if we can call them so, are related to the unnaturalness of the result, and then to asymmetries more or less accentuated.