Dermal Fillers Explained: How They Restore Volume and Refresh the Face

Dermal fillers sit right at the top of the list of the most requested treatments in facial aesthetics, second only to anti-wrinkle injections. Most people have heard of them. Far fewer understand what they actually are, where they belong on the face, or why so much of the conversation these days centres on that phrase you keep hearing: volume loss.

The short version is that fillers are not a single product doing a single job. They are a family of gels of different weights and textures, chosen to match the area being treated and the effect you are after. Used well, they replace what time quietly takes away and bring the face back into balance. Used without a plan, they can look obvious, and that is the outcome no one wants.

This guide walks through the questions our doctors are asked most often. What are fillers? What do they do? When will you see a difference, and how long will it last? And crucially, where on the face do they earn their keep? If you take one idea away, let it be this: the smartest filler treatments rarely start where you think the problem is.

What dermal fillers actually are

Most of the fillers used in reputable clinics, and all of the ones we favour at Wellface, are made from hyaluronic acid. That name sounds clinical, but hyaluronic acid is a sugar molecule your body already produces in abundance. It sits in the skin, the joints and the eyes, and one of its main talents is holding on to water. It is what keeps young skin looking plump, bouncy and hydrated.

As we age, the amount of hyaluronic acid in the skin falls, along with collagen and the fat pads that give the face its youthful contour. A hyaluronic acid filler is essentially a refined, stabilised version of that same molecule, formulated into a smooth gel. When it is placed beneath the skin, it restores structure and draws in water, which is why the treated area looks fuller and more supported.

The important detail is that fillers are not all the same thickness. They range from very light, thin gels through to firm, heavy ones. A soft, fine filler is ideal for delicate work such as smoothing fine lines or gently defining lips. A firmer, more robust filler is used deeper down where the face needs genuine lift and scaffolding, such as the cheeks, chin and jawline. Choosing the right consistency for the right layer is a large part of what separates a natural result from an overdone one.

There is another reason hyaluronic acid remains the gold standard. Because it is a substance the body recognises, it can be dissolved if ever needed using an enzyme called hyaluronidase. That built-in safety net is a genuine reassurance, and it is one of the reasons our doctors work almost exclusively with this type of filler.

What fillers do and when you will see results

One of the most appealing things about fillers is how quickly they show. This is where they differ sharply from anti-wrinkle injections. With Botox and similar products, nothing happens on the day; the effect creeps in over roughly two weeks as the muscle relaxes. Filler is the opposite. The moment the gel goes in, the volume is there.

That immediacy changes the whole feel of the appointment. Because the result appears in real time, your practitioner can work in stages and check in with you as they go. They might treat one side of the face, pause, and show you the difference against the untreated side before using the rest of the syringe. Are you happy? Shall we carry on, or add a touch more? That running conversation is one of the quiet advantages of filler, and it helps steer the outcome towards exactly the look you want rather than a fixed recipe.

That said, the version of your face you see walking out of the clinic is not quite the final one. Hyaluronic acid attracts water over the following days, and there is usually some swelling on top. The true, settled result tends to reveal itself over one to two weeks as any puffiness resolves and the gel integrates with the surrounding tissue. So the day-of result is a very good preview, but give it a fortnight before you judge it properly.

Why everyone talks about volume loss

Here is the shift in thinking that tends to surprise people. When someone looks in the mirror and feels their face has aged, they usually point at the lines. The shadows under the eyes. The creases running from the nose to the mouth, and the ones dropping from the corners of the mouth towards the chin. It is natural to want those lines filled directly.

But the lines are often the symptom, not the cause. Facial ageing frequently begins higher up, in the cheeks and the mid-face. As the underlying fat pads shrink and descend, the whole face loses its support. The cheeks flatten, the under-eye area starts to look hollow and shadowed, and everything below is gently tugged downward. That downward pull is what deepens the folds around the mouth and gives the lower face a heavier look.

This is why an experienced injector will often resist the urge to chase the lines. Rebuild the volume where it was actually lost, usually the cheeks, and you support the eye area above and soften the folds below in one move. The face lifts subtly, the shadows lighten, and the result reads as sculpted and rested rather than filled. It will not erase every line completely, and honest expectations matter here, but restoring volume at the source produces a far more natural refresh than pumping product straight into a crease.

The consultation matters more than the syringe

Because of all this, the conversation before any needle comes out is arguably the most important part of the treatment. When a patient says they feel their face looks tired and they want their nasolabial lines filled, a good doctor will step back and assess the whole face first. Very often the plan that follows starts at the cheeks, not the lines the patient walked in worrying about. Getting that sequence right is where clinical judgement earns its place.

Where fillers go on the face

Fillers are versatile, and the same core material can be used across very different areas simply by changing the consistency and the technique. These are the regions our doctors treat most often.

Lips

Lip filler is probably the best known use of all. For younger patients it is usually about gently adding fullness and shape. For older patients, restoring a little volume can make the mouth look softer and more youthful, since lips naturally thin with age. Filler is also excellent for correcting asymmetry, or balancing a top lip and bottom lip that have never quite matched. The goal in every case should be lips that suit the face, not lips that announce themselves.

Cheeks and mid-face

As covered above, the cheeks are where a great deal of facial ageing begins, which makes them one of the most rewarding areas to treat. A firmer filler placed here restores the lost contour, gives the mid-face its support back, and has a knock-on lifting effect on the eyes and the lower face. For many patients this is the single most transformative area, precisely because it addresses the root of the problem.

Nasolabial and marionette lines

The folds from the nose to the mouth (nasolabial) and from the mouth towards the chin (marionette) can be softened directly with a thinner, more delicate filler. Often this is done as a finishing touch after the cheeks have been supported, rather than as the main event. Treating the lines alone, without addressing the volume loss driving them, tends to give a flatter, less convincing result.

Chin and jawline

The lower face is where filler really shows its sculpting ability. A receded or small chin can throw the whole profile out of balance, and a well-placed amount of filler can bring it forward and improve the side view considerably. Combined with jawline filler, it can sharpen definition, create a cleaner line and help disguise early jowling, giving the lower face a lifted, more contoured look. This is popular with both men and women who feel their profile lacks structure.

How long fillers last and what affects it

Hyaluronic acid fillers are not permanent, and that is by design. The body slowly breaks them down over time, which is part of what keeps them safe and adjustable. As a general rule, results last somewhere between six months and around a year and a half, though the exact figure depends on several things.

The biggest factor is location. Areas that move constantly, such as the lips, tend to metabolise filler faster and may need refreshing at around six to twelve months. More stable areas like the cheeks can hold their result considerably longer, often twelve to eighteen months or more. The type and thickness of the gel matters too, as firmer, more robustly cross-linked fillers used for structural support generally outlast the soft, fine gels used for delicate work.

Your own body plays a part as well. A faster metabolism, an active lifestyle and significant sun exposure can all shorten how long results last. Interestingly, many people find that once they have topped up the same area a few times, the results seem to hold for longer. Rather than waiting for filler to disappear entirely, most patients book a review or maintenance appointment before that point so the look can be refreshed seamlessly.

Downtime, aftercare and planning ahead

Filler is a low-downtime treatment, and most people go straight back to their normal day. That does not mean it is entirely without after-effects. As with any injectable, you can expect some bruising, mild swelling, small lumps or bumps and a little tenderness in the first few days. This is completely normal and simply your body responding to the injections.

Swelling usually peaks within the first day or two and then settles steadily over the following days. Bruising, if it appears, tends to fade within a week or so. Any small areas of firmness generally soften as the filler integrates over one to two weeks. To help things along, our doctors typically advise keeping the area cool with a cold compress in the first day, sleeping with your head slightly elevated, and being gentle with the treated area rather than pressing or massaging it.

A few sensible things to avoid in the first day or two make a real difference:

• Strenuous exercise, saunas, steam rooms and very hot environments, all of which increase blood flow and can worsen swelling.
• Alcohol and blood-thinning painkillers such as ibuprofen and aspirin, which make bruising more likely.

This is also why timing matters if you have something important coming up. If you are planning a big celebration, a wedding or any occasion where you want to look your absolute best, book your filler at least two weeks beforehand. That gives any bruising and swelling time to disappear and the result time to settle, and it leaves room for a review appointment with your practitioner to check everything looks exactly as it should before the day arrives.

Common questions about dermal fillers

Do fillers hurt?

Most people describe the sensation as very manageable. Many modern fillers contain a local anaesthetic, and a numbing cream is often applied beforehand, so what you tend to feel is pressure and the occasional small pinch rather than sharp pain. Some areas, such as the lips, are more sensitive than others, and your doctor will make you as comfortable as possible.

Will fillers look obvious or overdone?

Not when they are placed thoughtfully. The overfilled look that gets talked about is usually the result of too much product in the wrong areas, not filler itself. A doctor-led approach that restores volume where it was genuinely lost, and works in stages with your feedback, is designed to look like a fresher version of you rather than a different face.

Can filler be removed if I do not like it?

Yes, and this is one of the great advantages of hyaluronic acid. If you are unhappy with the result, or in the rare event of a complication, the filler can be dissolved with an enzyme injection. This safety net is a major reason our doctors work with hyaluronic acid products.

How is filler different from anti-wrinkle injections?

They do completely different jobs. Anti-wrinkle injections relax the muscles that create expression lines, and the effect appears gradually over about two weeks. Fillers add volume and structure, and the result is visible immediately. Many patients combine the two, using each for what it does best.

How soon can I have a top-up?

It is best to wait until the treatment has fully settled, usually around two weeks, before assessing whether more is needed. Your review appointment is the ideal moment to decide, as your practitioner can see the true result and add small refinements if appropriate.

Come and talk it through with us

Fillers reward careful planning and a doctor's eye far more than a rushed appointment ever could. The best results come from understanding your whole face, working out where the volume has actually gone, and treating the cause rather than chasing the symptom. That is exactly the kind of considered, unhurried approach our doctors take.

If you have been wondering whether fillers might be right for you, or you simply want an honest opinion on what would and would not help, book a consultation at Wellface in Cobham, Esher or Wimbledon. We will assess your face properly, talk through your options with no pressure, and design a plan that keeps you looking like yourself, only more rested.