When Do the Effects of Shrink Begin? A Complete Guide to Effects by Stage and Duration

Hello. I am Wonjin Jo, the director of Chai Clinic, where I have been providing dermatological care in Hongdae for 10 years.

I had Shrink treatment, but I don't think it worked.

In fact, Shrink is not a treatment that visibly lifts the face immediately after the procedure.

Its effects appear gradually over time.

If you do not understand this process before receiving treatment, it is easy to feel disappointed and wonder, “Did I just waste my money for nothing?”

So today, I will explain how the effects of Shrink appear in sequence, starting immediately after treatment,

and how long those effects last.

Understanding this process can help reduce unnecessary anxiety and prevent spending money on treatment without seeing the expected results.

Table of Contents

1. How Shrink works

2. Immediately after treatment to 1 week: When immediate tightening becomes visible

3. 2 weeks to 1 month: The period when it may feel as though the effects have disappeared

4. 2–3 months: When the true effects begin to develop

5. How long do the effects of Shrink last?

6. The effects of Shrink appear gradually

7. How Shrink works

Shrink is a HIFU treatment, meaning high-intensity focused ultrasound.

It concentrates scattered ultrasound waves on a single point to create tiny thermal coagulation points in the dermis and SMAS layer, the deep fascial layer that supports the face.

The effects occur in two stages.

The first is immediate collagen contraction.

When heat is applied, collagen contracts at the treatment site, temporarily tightening the skin.

This is when you may experience a noticeable lifting and tightening sensation.

The second is collagen regeneration.

The skin, having experienced microscopic damage, repairs itself and produces new collagen.

This process takes place over several months, not just a few days.

This is the key point.

The immediate effect is temporary, while the true effect develops gradually over time.

That is why the sensation immediately after treatment can differ from the result three months later.

If you are wondering how to receive Shrink treatment properly, please be sure to read the article below.

I have summarized, from a doctor's perspective, ways to improve the results during treatment.

2. Immediately after treatment to 1 week: When immediate tightening becomes visible

Immediately after treatment, collagen contracts in response to heat,

so your skin may feel firmer and smoother.

However, there is also a slight visual distortion involved at this stage.

Mild swelling and flushing caused by the treatment stimulation

can make the skin appear tighter than it actually is.

Therefore, you should not consider how your skin feels during this period to be the final result.

3. 2 weeks to 1 month: The period when it may feel as though the effects have disappeared

“Shrink doesn't seem very effective.”

Most people who receive the treatment feel disappointed around this time.

The firmness you felt immediately after treatment comes from the temporary contraction of collagen caused by thermal energy,

as well as mild swelling caused by the treatment stimulation.

These two factors create a temporary effect.

As time passes, the contracted tissue settles back into place and the swelling subsides,

so this temporary effect also fades.

However, the actual effect comes from the skin producing new collagen on its own in response to the thermal stimulation.

The cells that produce collagen, called fibroblasts, are stimulated to synthesize new collagen,

but it takes weeks to months—not just a few days—for that collagen to become firmly established.

That is why real changes appear as new collagen forms.

If you cannot wait through this period and conclude, “Shrink is not very effective after all,”

it means giving up just before the effects are about to appear.

That is why I recommend waiting a little longer.

4. 2–3 months: When the true effects begin to develop

As newly formed collagen becomes established in the skin,

elasticity begins to improve, and changes such as a more defined jawline and cheek contour become visible.

Because the result comes from the skin filling out on its own rather than being artificially pulled at the surface, it tends to look natural and less awkward.

As sagging contours become more defined, the jawline becomes clearer, and sagging cheeks and lines extending down toward the corners of the mouth become more refined.

As the dermis becomes fuller, fine lines may become less noticeable, and the skin texture may also appear smoother and more even.

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Therefore, it is appropriate to evaluate the effects of Shrink around two to three months after treatment.

If possible, take photographs before treatment and compare them at this point.

You may not notice much change when looking in the mirror every day, but differences are often clearer when comparing photographs.

5. How long do the effects of Shrink last?

Although there are individual differences, the effects generally last around six months.

The duration can vary considerably depending on the amount and areas treated, the condition of your skin, and the rate of aging, so some people may feel that the effects last for a shorter period.

There is one thing I would like to say honestly.

Shrink is not a treatment that stops aging.

Because the skin continues to age after treatment,

receiving treatment at appropriate intervals rather than treating it as a one-time procedure can allow the effects to accumulate and help you maintain a better condition for longer.

There is one more thing to keep in mind. Shrink is not a solution for every type of sagging.

It can be particularly helpful for early loss of elasticity or mild sagging in people in their 20s and 30s,

but when volume or fat is the cause, or when sagging has already progressed significantly, Shrink alone has limitations.

In such cases, it may be better to combine or replace it with other treatments, such as Ultherapy or thread lifting.

Even if I provide treatment when it is obvious that you are unlikely to see meaningful results, you will not be satisfied with the outcome anyway.

I believe it is better for both me and the patient to explain these limitations clearly in advance.

When considering various laser lifting treatments, please read the article below before visiting a clinic.

At the very least, it may help you avoid being overcharged simply because you did not have enough information.

6. The effects of Shrink appear gradually

Shrink is a treatment that briefly tightens the skin immediately after the procedure,

may feel as though its effects have faded after about one month,

and produces its true effects around two to three months later as new collagen develops.

Therefore, you should wait at least two to three months before deciding that “it has no effect.”

Of course, to achieve proper results, the number of shots and the appropriate depth for each treatment area must also be correctly matched.

If you are considering Shrink, understand the progression of its effects before beginning.

Doing so alone can greatly reduce unnecessary anxiety and wasted expense.

Thank you. This was Wonjin Jo.