Botox: The Complete Guide for First-Timers

Botulinum toxin is one of the most studied substances in the history of aesthetic medicine. And still, the same misconceptions keep circulating — in conversations, on forums, in social media comments. This article addresses each myth with clinical facts, without oversimplification.

In Portugal, botulinum toxin can only be administered by physicians licensed by the Ordem dos Médicos. All treatments are regulated by INFARMED. Context matters.

Myth 1: "Botox looks fake and freezes your face"

Fact: The "frozen face" effect is a result of overdosing or incorrect technique — not the product itself. Botulinum toxin blocks muscle contraction in a dose-dependent way. At the right dose, the muscle relaxes but doesn't paralyse: expression is preserved, lines soften.

The difference between a natural result and an artificial one lies almost entirely in the medical decision: how many units, at which points, for that specific anatomy. An experienced physician who understands the patient's facial movement produces results that people around them cannot identify as treatment. A "frozen face" is a sign of the wrong clinic, not the wrong product.

Myth 2: "Botox is very painful"

Fact: Discomfort is minimal. The needles used for botox injections are 30 to 32 gauge — among the finest available in medicine. Each injection takes 1 to 2 seconds. Most patients describe the sensation as a slight pinch, similar to a small insect bite.

In more sensitive areas (such as the upper lip or nose), topical anaesthetic or cryotherapy can be applied beforehand. A full forehead, glabella, and crow's feet treatment usually takes less than 15 minutes. Significant pain during a botox session is, in most cases, a sign of incorrect technique.

Myth 3: "Botox is poison"

Fact: This is technically incomplete. Botulinum toxin is derived from the bacterium Clostridium botulinum — but what is used in aesthetic medicine is a highly purified, diluted protein, approved by INFARMED and the EMA (European Medicines Agency). The therapeutic dose is approximately 10,000 times lower than the dose that would cause systemic effects.

Botulinum toxin has documented medical use since the 1980s — initially to treat strabismus and muscle spasm. It is among the substances with the largest number of clinical safety studies in all of medicine. Saying "it's poison" is the same logic that says paracetamol is poison — at therapeutic doses, it is not.

Myth 4: "Botox is addictive"

Fact: Botulinum toxin creates no physical or chemical dependence. There is no tolerance mechanism, no withdrawal syndrome, no receptors that "demand" more product. The EMA and long-term studies have not identified any addiction profile.

What exists — and is sometimes confused with "addiction" — is aesthetic preference: patients like their results and want to maintain them. That is a cosmetic choice, not a dependency. If you stop treatments, the muscle gradually recovers and the face returns to its natural state. There is no rebound effect, no worsening.

Myth 5: "Starting preventive botox too young is harmful"

Fact: There is no clinical evidence of harm from starting preventive use in adults from their mid-twenties, when expression lines begin to appear at rest. The concern about "starting too young" is predominantly social and cultural — it has no medical basis.

The preventive rationale is: if the muscle is kept in a relaxed state before lines deepen, the skin suffers less cumulative damage. It is not different from using sunscreen before developing sun spots. What is inappropriate is starting treatment in minors or in adults without real indication. A proper medical consultation is the filter for this.

Myth 6: "Botox has serious long-term side effects"

Fact: Botulinum toxin is among the substances with the strongest long-term safety record in medicine. Follow-up studies lasting 10 to 15 years in patients with regular use have not revealed systemic effects, tissue accumulation, or permanent neurological changes at therapeutic doses.

Documented side effects are local and transient: bruising at the injection site, mild swelling, headache in some patients after the session, and rarely transient eyelid ptosis (drooping) — the latter resolving spontaneously in 2 to 6 weeks. Serious systemic effects at aesthetic doses are extremely rare and are generally associated with incorrect injection or adulterated product.

Myth 7: "Botox stops working over time"

Fact: Botulinum toxin does not lose efficacy with repeated use in the vast majority of patients. What can happen in rare cases is the development of neutralising antibodies — more associated with high doses and very short intervals between treatments (less than 3 months). At aesthetic doses with adequate intervals, immunological resistance is very infrequent.

What patients describe as "botox stopped working" is usually one of two scenarios: doses that were progressively reduced without the patient noticing, or individual accelerated metabolism that shortens duration — which is addressed by adjusting dose or interval, not by changing product.

What matters more than the product

Most botox myths stem from bad treatment experiences — or from content created by people without clinical training. The reality is that results vary enormously depending on who injects, not which toxin brand is used. The brands available in Portugal (Botox®, Dysport®, Azzalure®, Xeomin®) have equivalent safety profiles when used correctly.

The most important criterion when choosing a clinic is not the product — it is the physician. Verify their medical licence, ask about specific aesthetic medicine training, and assess whether the initial consultation includes real evaluation of your facial movement and goals, or whether it is simply a sales session.

For more about how the treatment works, see our complete guide to botulinum toxin for first-timers. For areas treated and pricing at Cosmo Clinic, see the botox treatments page.