How often should Density be repeated?
“How soon can I have Density again?” is the question we hear most often. There is no fixed number of months, and this column explains why, and what we look at instead.
The short answer
There is no established interval for repeating Density. Advice such as “every six months” does not come from a trial that compared intervals; it is a market convention. The human data for Density stopped at 24 weeks, and nothing beyond that point has been measured. So Miso Clinic in Daegu does not book the next session by the calendar. We look at the face again two to three months after treatment and decide then. Miso Clinic is at 4F Bombom Building, 125 Dongdeok-ro, Jung-gu, Daegu, in front of Exit 1 of Kyungpook National University Hospital station. Phone 053-428-2700. Weekdays 11:00–19:00, Saturday 10:00–16:00 with no lunch break, closed Sunday and public holidays.
Why the answer cannot be a number of months
Two things are needed before an interval can be stated: data on how long the effect lasts, and a comparison showing that different intervals give different results. Density has neither.
| Device | Study | Last measurement |
|---|---|---|
| Density | Oku 2025 · 16 people · one session · uncontrolled | 24 weeks |
| XERF | Three studies · 20, 39 and 16 people | 12 weeks · 90 days · 3 months |
Nothing has been measured past 24 weeks, and we found no trial that assigned patients to a three-month versus a six-month interval. So “Density every six months” is a phrase the market settled on rather than a finding.
One more note. The 2026 work often cited for the claim that starting early and repeating regularly pays off in the long run was computer modelling, not a study in people.
What we look at instead: the two to three month review
Radiofrequency results are not finished on the day of treatment. The timeline below comes from monopolar radiofrequency studies other than Density and has no control group, but it is enough to show when a judgement becomes meaningful.
| Time point | What changes |
|---|---|
| Immediately | A tight feeling from immediate collagen contraction and swelling. We do not read it as a result. |
| 4 weeks | Device-measured elasticity becomes significant; clinical scoring does not yet (20 Korean women). |
| 12 weeks | Clinical scoring of jawline and nasolabial folds becomes significant and holds to 24 weeks. |
| 4-6 months | Two independent studies place the peak here. |
| 7-10 months | One study reports a slight decline. Data past this point is thinner still. |
Instruments move at four weeks, but what a person can see settles at about twelve. That is why we do not call a treatment a success or a failure before two to three months have passed. Discussing a repeat treatment in that window means drawing a conclusion about a change that is still under way.
The five things that decide the next session
| Situation | What we do |
|---|---|
| Less than two to three months have passed | We wait. The change is still developing. |
| Laxity remains at the review | We design again, with the same device or another one. |
| The change is holding | We do not hurry. People age at different speeds. |
| Strong heat-based treatment on the same area recently | We postpone until recovery is complete. |
| Volume loss has become the visible problem | We look at volume treatment instead of a device. |
The last row comes up more often than any other. When what looked like sagging is really lost volume, repeating the same device does not solve it. The answer then is not a shorter interval but a different treatment. This is clinical judgement at Miso Clinic, not a criterion drawn from a trial that compared intervals.
What you feel and what is measured can disagree
The sense that the effect has faded, and the sense that it is still there, can both differ from measurement. This has been seen repeatedly across lifting treatments.
| Source | What diverged |
|---|---|
| Review of 16 ultrasound studies · 90 days | Physicians rated 92% improved; patients rated 42% |
| One-year study in 20 people | Blinded raters 43% versus patient satisfaction 95-100%. Quantified lift peaked at 90 days and fell to 22-33% at one year |
Physician, patient and blinded observer give different answers about the same moment. A repeat treatment timed by feeling alone can therefore come too early or too late. That is why we photograph before treatment under fixed conditions and repeat the photograph under the same conditions.
Are there reasons to treat sooner
Yes, but treating sooner to chase a bigger result and treating sooner because the plan is not finished are different things.
- The area to be covered was wide and the plan was to do it in stages
- The first session was deliberately conservative and the plan was to continue after seeing the response
- Laxity and volume are both being treated and the order was split
These three are one planned course rather than a repeat treatment. When you ask “when should I come back?”, it is worth knowing whether the answer is part of the plan or a new decision point. Fees depend on the area and the extent of treatment and are explained by phone or at the clinic.
Summary: what is established and what is not
Established
- Human follow-up for Density ended at 24 weeks
- For radiofrequency in general, instruments moved at 4 weeks and clinical scoring at 12 (uncontrolled)
- At the same time point, improvement rates differ sharply by rater (92% versus 42%)
Not established
- Data on Density at six months or one year
- Any trial comparing retreatment intervals for Density
- Human data showing that regular repetition is better in the long run
Density retreatment interval: common questions
How many months apart should Density be repeated?
There is no established interval, because no trial has compared intervals for Density. Miso Clinic looks at the face two to three months after treatment and decides then.
I was told to repeat it every six months. Is that wrong?
It is less wrong than differently sourced. Every six months did not come from a trial comparing intervals; it is a convention. It suits some people and not others.
The effect seems to have faded. Can I be treated again straight away?
If less than two to three months have passed it is better to wait. What is clinically visible settles at about twelve weeks, and before that the change is still developing.
Does treating more often make the result last longer?
There is no human data showing that. The 2026 work cited for early and regular treatment was computer modelling.
When does Density start to show?
Device-measured elasticity moves at about four weeks and visible change settles at about twelve. The human data followed patients to 24 weeks and no further.
What should I prepare before the next session?
Keep a photograph taken under the same conditions as before. Photographs taken in different light or at a different angle cannot be compared.
Where can I discuss Density in Daegu?
Miso Clinic is at 4F Bombom Building, 125 Dongdeok-ro, Jung-gu, Daegu, in front of Exit 1 of Kyungpook National University Hospital station, 053-428-2700. Weekdays 11:00-19:00, Saturday 10:00-16:00, closed Sunday and public holidays.
Read next
Product pages
Product pages: Density · XERF · Oligio Kiss
Who wrote this
Written and reviewed by Lee Chi-Hak, MD, director of Miso Clinic, Daegu. The treatment standards and injection design set out here are the ones we use in practice.
| Medical director | Lee Chi-Hak, MD |
|---|---|
| Address | 4F Bombom Building, 125 Dongdeok-ro, Jung-gu, Daegu, South Korea · Exit 1, Kyungpook National University Hospital Station |
| Phone | +82-53-428-2700 |
| Hours | Weekdays 11:00–19:00 (lunch 13:00–14:00) / Saturday 10:00–16:00 (no lunch break) / Closed Sundays and public holidays |
| Columns | All clinical columns |
| Reference library | All booster and device references |
References
- Density human data — Oku K, J Cosmet Dermatol 2025;24(10):e70504, PMID 41090512. 16 Japanese participants · one session · followed to 24 weeks. Tightening 0.82 mm, lower-face thickness −0.89 mm, pain 1.4/5. No control group, single author, and nothing measured beyond 24 weeks.
- Three human studies of XERF — Hwang JK, Medical Lasers 2025;14(1):23–30 (20 people · 12 weeks) · Weiss RA et al., Cureus 2026;18(3):e104546, PMID 41930066 (39 people · 90 days, manufacturer supported) · Erlich G et al., Lasers Med Sci 2026;41(1), PMID 42611100 (retrospective, 16 people · 3 months). None had a control group and the longest follow-up is 90 days.
- Timeline of radiofrequency results — Cosmetics 2024;11(3):71 (20 Korean women · one session · 4, 12 and 24 weeks: device-measured elasticity moved at 4 weeks, clinical scores were not significant at 4 weeks but were at 12 and 24) · Fitzpatrick 2003 and Edwards AF et al., Dermatol Surg 2013;39:104–110 (peak at 4-6 months, slight decline at 7-10). All uncontrolled, and none of them studied Density or XERF.
- Improvement rates depend on who is looking — review of 16 ultrasound lifting studies (IJERPH 2023;20(2):1522): at 90 days physicians rated 92% improved while patients rated 42%. Werschler 2016 (20 people): at one year blinded raters said 43% while patient satisfaction was 95-100%, and quantified lift peaked at 90 days then fell to 22-33% at one year. Ultrasound data, cited here only for the rater gap.
- Evidence for comparing devices — Aesthetic Surgery Journal Open Forum 2026 systematic review (15 studies · 1,230 people, one randomised trial). Heterogeneity prevented meta-analysis and the review states that no direct device-to-device comparison was identified.
- Density specifications — Jeisys Medical published data: monopolar then bipolar in sequence, up to 400 W, RIC impedance adjustment, five-stage gas cooling, tips ALPHA 600 · Eye 600 · Face 1,000 · Body 600 shots (sealed guaranteed count). Approved as a medical device by the Korean MFDS. Tip areas are not published by the manufacturer.
- Fees and patient inducement — Medical Service Act Articles 45 (posting of non-covered fees), 27(3) (prohibition of inducement for profit) and 56(2) (prohibited advertising). That is why no price or discount appears in this column.
- Miso Clinic practice guidance — indication criteria, site-by-site design, and the explanation and consent procedure. This is the source for every sentence marked as clinical judgement.
Everything in this column is general information and does not replace medical diagnosis or treatment. Effects and side effects vary with individual skin condition, age and underlying illness, and the same result is not guaranteed for everyone. Any decision to proceed should be made in an in-person consultation with a physician.
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