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Botox by Area: Dosage and Duration from Expression Lines to Muscle Slimming

김진겸 · Board-certified Dermatologist
Seoul National University College of Medicine · Board-certified Dermatologist

Botox solves very different problems with a single drug. It can relax the small muscles that crease the skin when you make expressions, or shrink the bulk of thick muscles. Dosage and recovery shift by area, so knowing the basics makes the choice easier.

Expression lines: forehead and glabella

Horizontal forehead lines and vertical frown lines are dynamic wrinkles that appear with movement. Easing the muscle's motion softens them. The dose here is relatively small, and results usually sharpen within two weeks.

Overdo it and the face can look stiff or the brows may feel heavy. If you want a natural look, staying within a sensible range is everything.

Muscle slimming: jaw and calves

When the chewing masseter muscle makes the jaw look square, or calf muscles stand out, Botox reduces the bulk. This calls for a much larger dose than expression lines, and the change appears gradually.

  • Square jaw: contours start softening around a month in
  • Calves: the line shifts over several weeks as the muscle shrinks

Duration runs 3 to 6 months

Botox isn't permanent. It typically holds for three to six months, then fades as the muscle moves again. With repeated sessions the muscle weakens, sometimes stretching the interval.

Aftercare right after the session

The first few hours let the drug settle. Rubbing the site or lying down can spread it where you didn't intend.

  • Avoid lying down or rubbing the area for about four hours
  • Skip sauna, hard exercise, and alcohol that day

Start small on the first session

The same dose lands differently from person to person. Going conservative first, then topping up after a two-week check, is the safer route. Pile it on at once and a frozen look or asymmetry becomes hard to reverse. Review the consultation checklist before booking, and see Botox brand comparison for product differences.

Frequently Asked Questions

Will Botox freeze my expressions?

At the right dose, natural movement remains. A frozen feel usually signals too much, and it eases as the effect wears off.

Does it hurt?

It's a few quick pricks with a fine needle, so pain is minimal. Numbing cream is an option for sensitive patients.

How often should I get it?

Every three to six months, as the effect fades, is typical. Rather than going too often, re-treat when it starts wearing off.


This article is for general information only and does not replace medical advice, diagnosis, or treatment. Always consult a qualified medical professional before any procedure; prices, results, and side effects vary by individual skin condition and clinic.

김진겸 · Board-certified Dermatologist

A board-certified dermatologist who graduated from Seoul National University College of Medicine. The posts on this blog are written and reviewed by Dr. Kim. All content is for general information only and does not replace a diagnosis or prescription from an in-person consultation.