Non-surgical fat removal in London — Onda body contouring

How ONDA reduces stubborn fat without surgery

Non-surgical fat removal at our Islington clinic uses ONDA, a body contouring system that uses microwave energy to heat fat cells beneath the skin. Heated fat cells break down and are cleared by the body over the following weeks, so the treated area becomes gradually slimmer. The skin surface is cooled throughout, and there are no needles, incisions or anaesthetic.

ONDA is for pockets of fat that stay put despite a steady diet and regular exercise: the lower abdomen, flanks, inner and outer thighs, upper arms and back. It is not a weight-loss treatment, and it will not change the number on the scale in any meaningful way.

The principle is straightforward. Fat cells are more sensitive to heat than the skin and muscle around them. ONDA delivers microwave energy through a handpiece that is moved over the area, concentrating the heat in the fat layer while a cooling system protects the surface of the skin. Fat cells that are damaged in this way are not replaced; the body breaks them down and clears them through its normal processes. That is why the change is gradual, and why the final result of a course is judged some weeks after the last session rather than on the day.

Because the treatment works on the area treated, it is best thought of as a contouring tool. It refines shape in a defined area. It does not reduce overall body fat, and it does not replace the habits that keep weight stable.

What non-surgical fat removal can and cannot do

People searching for non-surgical fat removal in London are usually looking for one of three things: a flatter lower tummy, a less prominent "love handle" over the flanks, or a smoother line to the thighs or upper arms. ONDA can help with each of these when the fat is localised and pinchable.

It is less suited to some common concerns, and it is better to know that before you book:

• Deep abdominal fat. Fat stored around the organs, beneath the abdominal muscles, cannot be reached by any external device. It is a matter of metabolic health, and your GP is the right person to discuss it with.
• Loose skin with little fat beneath it. If the main concern is laxity rather than fat, a skin-focused treatment is usually more appropriate, and we will say so.
• Large-volume reduction. If the aim is to remove a substantial amount of fat in one step, surgery is the more appropriate route.
• Rapid results. Change develops over weeks, not days.

Who it suits, and who it does not

• Adults at or near a healthy, stable weight with a localised area of stubborn fat
• People who want a gradual, natural-looking change without surgery or downtime
• Not suitable in pregnancy, with metal implants in the treatment area, or with some medical conditions, which we check at consultation
• If weight loss is the goal, diet, activity and, where appropriate, your GP are the right starting point

We also take care with anyone who has a pacemaker or other implanted electronic device, active skin infection or broken skin over the area, reduced sensation in the area, or a medical history that raises a question we cannot answer. In those cases we may ask you to speak to your GP first, or advise against treatment altogether. Realistic expectations matter as much as anatomy: the best outcomes come from people who want a modest, well-defined improvement and who understand that results vary from person to person.

ONDA or liposuction?

Liposuction removes more fat in one procedure, but it is surgery, with anaesthetic, recovery time and surgical risk. ONDA removes less per session and works over a course, with no downtime. For many people with a modest, well-defined area, ONDA is the proportionate choice. If your goals need surgery, we will tell you honestly. You can also compare ONDA and CoolSculpting.

Many people searching for non-surgical fat reduction have CoolSculpting in mind, because it is the best-known name. Our page on a CoolSculpting alternative explains how ONDA fits. We do not offer CoolSculpting. It freezes fat, while ONDA heats it, and both are established, non-surgical approaches. We chose ONDA for our clinic, and the comparison page sets out the differences factually.

ONDA or fat dissolving injections?

For very small areas, particularly fat under the chin or along the jawline, fat dissolving injections with Aqualyx can be a better fit than a device. Aqualyx is injected directly into the fat layer, where it breaks down the walls of fat cells so the body can clear them. It suits small, precise pockets; ONDA suits larger, flatter areas such as the abdomen and flanks. Some people benefit from both, used in different areas. At consultation we will explain which approach suits the area you have in mind, and why. Our page on double chin treatment covers that area in more detail.

Your consultation

Every course begins with a consultation with Dr Vishal Patel. We ask about your health, any medication, previous treatments and how your weight has changed over time. We then look at the area itself: how much fat is pinchable, how the skin behaves, and whether the shape you are unhappy with is mostly fat, mostly skin, or a combination.

We will explain what ONDA can realistically achieve for you, how many sessions are likely, and what the course will cost. With your consent, we take standardised photographs so progress can be compared fairly later. If ONDA is not the right answer, we will tell you, and suggest what is. The skin and aesthetic consultation is £65, redeemable in full against treatment.

What a session feels like

Each session takes around 30 to 45 minutes per area. You feel deep warmth and a cooling sensation on the skin. Mild redness or tenderness can last a day or two, and you can go back to normal activity straight away.

On the day, the area is cleaned and marked, and a contact medium is applied. The handpiece is then moved steadily across the area in a set pattern. We check in with you throughout, and settings can be adjusted if the warmth becomes uncomfortable. Most people describe the sensation as similar to a hot stone massage that occasionally becomes more intense for a moment. There is nothing to recover from afterwards; many patients come in at lunchtime or on the way home from work.

How many sessions, and when will I see results?

Most courses involve 3 to 6 sessions per area, spaced a few weeks apart. The exact number depends on the area, how much fat is present and how you respond. Change is gradual, and results usually develop over 8 to 12 weeks after a session as the body clears the treated fat cells. We review your photographs partway through the course and after it, so decisions about further sessions are based on what has actually changed.

Fat cells that have been cleared do not return, but the remaining fat cells in any area can still enlarge if weight increases. Keeping your weight stable is what protects the result.

Aftercare

• Drink plenty of water and keep active in the days after each session.
• Avoid very hot baths, saunas and intense heat on the area for a day or two while any redness settles.
• Gentle massage of the area is fine if it feels comfortable.
• Contact the clinic if you notice anything that concerns you, such as tenderness that is increasing rather than settling.

Risks, and how we reduce them

ONDA is a low-downtime treatment, but no treatment is without risk. The common effects are temporary: redness, warmth, tenderness and occasionally mild swelling or bruising in the treated area. Less commonly, people notice a short period of altered sensation or small firm areas under the skin, which usually settle. Burns are rare.

We reduce these risks with a careful medical history, by checking the area before every session, by using appropriate settings for your tissue, and by keeping the handpiece moving with continuous surface cooling. Treatment is planned and overseen by Dr Vishal Patel, who is trained by Lynton Lasers in the use of ONDA.

Cost of non-surgical fat removal in Islington

• ONDA: £300 per session
• ONDA course of four: £1,020 for a course of four sessions (15% off), including an online personal training session
• Aqualyx fat dissolving injections: from £350
• Skin and aesthetic consultation: £65, redeemable in full against treatment

The total cost of a course depends on how many areas are treated and how many sessions each needs. We will give you a written plan with the full cost before you commit to anything.

ONDA with personal training

Where it helps, ONDA can be combined with personal training in the same building. Treatment reduces fat in a defined area; training builds the muscle tone and habits that help the result hold. For people who are already working towards a goal, combining the two in one place keeps the plan coherent and practical. A course of four ONDA sessions is £1,020, 15% off the per-session price, and includes an online personal training session.

Why have ONDA at Dental & Wellness London

Dr Vishal Patel is Lynton Lasers trained, including ONDA, and oversees every body plan at the clinic. He has around 20 years in dentistry and ten years in facial aesthetics, and his training includes the International Fellowship in Advanced Aesthetic Science. Our approach is consultation-first: we would rather recommend less, or nothing, than a course that will not give you what you are hoping for.

Dental & Wellness London has been on Essex Road since 2009 and is rated 4.7 stars from more than 300 Google reviews. You can read more about Dr Vishal Patel.

Getting to our clinic in Islington, N1

The clinic is at 222 Essex Road, Islington, London N1 3AP, two minutes from Essex Road station and a short ride from Angel, Highbury, Canonbury, Hackney and Stoke Newington. Essex Road station is on the Great Northern line between Moorgate and Highbury & Islington, and buses 38, 56, 73, 341 and 476 stop on Essex Road. Many patients cycle or use a Lime or Forest e-bike. We are open Monday to Friday, 8am to 7pm, by appointment.

Clinically reviewed by Dr Vishal Patel · BDS · MSc Aesthetic & Restorative Dentistry · GDC 103127. Last reviewed 1 October 2026.

If you are still weighing up your options, our overview of ONDA Coolwaves brings them together in one place.