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Injectables · Botox

What Is Botox? Where It Works, How Long It Lasts

The expression-line treatment explained — mechanism, popular areas, and how to keep the result natural.

Hori Medical TeamReviewed by Dr. Peerapol6 min readJul 2026
What Is Botox? Treatment Areas, Timing and Safety at Hori Clinic Bangkok

Botox is the most performed aesthetic procedure in the world — yet "frozen face" fears still hold people back. Used correctly, it does not erase your expressions; it softens the overactive muscle pull that etches lines into skin. Here is what it does, where it works, and how doctors keep it looking like you.

What is Botox, really?

Botox is a purified botulinum toxin type A protein. Injected in tiny, precise doses, it temporarily reduces the nerve signal to a specific muscle. Less pull, softer creasing — expression lines fade and stop etching deeper. The effect is local, gradual and reversible.

Where it works best

  • Forehead lines — horizontal rows from raising the brows
  • Frown lines (11s) — between the brows
  • Crow's feet — smile lines around the eyes
  • Jaw slimming — relaxes bulky masseter muscles for a slimmer lower face and less grinding
  • Brow lift, gummy smile, chin dimpling, neck bands — refinement points your doctor may suggest

Onset, peak and duration

Expect first changes in 3–7 days, full effect around 2 weeks, and duration of roughly 3–6 months depending on the area, dose and muscle strength. Jaw slimming builds more gradually — the muscle visibly reduces over 4–8 weeks.

The best Botox is the kind nobody can point to — you just look rested.

How doctors keep it natural

"Frozen" results come from over-dosing or imprecise placement. A doctor who maps your individual muscle pattern uses the minimum effective dose, balances opposing muscles, and leaves enough movement for real expressions. A 2-week follow-up allows micro-adjustment instead of over-treating up front.

Safety & choosing a clinic

Botox has a long safety record when it is authentic product, stored correctly, and injected by a doctor. Red flags: prices too good to be true, no vial shown, non-medical injectors. At Hori, every injectable is doctor-performed with Thai-FDA approved products opened in front of you.

The short version

  • Botox softens overactive muscle pull — expressions stay, lines fade.
  • Results at ~2 weeks, lasting 3–6 months; jaw slimming builds over 4–8 weeks.
  • Natural outcomes come from minimum effective dosing by a doctor — not bargain pricing.

Frequently asked questions

Does it hurt?+

A very fine needle is used, with numbing cream if you like. Most describe a few seconds of ant-bite per point; the whole visit takes 10–15 minutes.

When will I see results and how long do they last?+

First changes in 3–7 days, full effect ~2 weeks, lasting about 3–6 months depending on area and muscle strength.

Will my face look frozen?+

Not with individualized dosing. Frozen looks come from too much product or poor placement — precise doctor technique keeps expressions natural.

Can I become resistant to Botox?+

True resistance is uncommon and linked to too-frequent dosing or high-complexing-protein products. Proper spacing (3+ months) and authentic products minimise the risk.

If you are comparing options

Quick answer

Botox: what to know first

Botulinum toxin temporarily reduces signalling to selected muscles. It is mainly used for dynamic lines or muscle-related concerns; discomfort is usually brief, change begins over several days and duration varies by dose, area and individual response.

Suitable for
Dynamic forehead, frown or crow's-feet lines, or selected muscle-related concerns after assessment
Discuss first
Discuss pregnancy or breastfeeding, infection at the site, neuromuscular disease, medicines and previous toxin response
Discomfort
A brief needle prick or sting at each point
Downtime
Small bumps, redness or bruising may occur; follow the clinician's aftercare advice
When change may be noticed
Often begins over several days; a follow-up around two weeks helps assess the settled effect
Alternatives
If the main concern is skin quality rather than muscle movement, compare Vitaran; fillers, devices or skincare address different causes
What Is Botox? Treatment Areas, Timing and Safety at Hori Clinic Bangkok

Medical review

Dr. Peerapol Riawraengsattha (Dr. Lhong)

Anesthesiology · Aesthetic Medicine · Thai medical licence 58253

Sources used

We used peer-reviewed sources for this article. Your result and recovery may be different from someone else’s, so use this page to prepare questions rather than predict an outcome.

  1. Guo Y, Lu Y, Liu T, et al. Efficacy and Safety of Botulinum Toxin Type A in the Treatment of Glabellar Lines: A Meta-Analysis of Randomized, Placebo-Controlled, Double-Blind Trials. Plast Reconstr Surg. 2015;136(3):310e-318e. doi:10.1097/PRS.0000000000001544
  2. Kaufman-Janette J, Cox SE, Dayan S, Joseph J. Botulinum Toxin Type A for Glabellar Frown Lines: What Impact of Higher Doses on Outcomes? Toxins (Basel). 2021;13(7):494. doi:10.3390/toxins13070494

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