Home / Procedures / Dermal fillers / What to ask

Dermal fillers subtopic · Last reviewed 16 September 2025

Written and maintained by the Clinics for Kings editorial desk·Edited by Morten Andersen & Fredrik Filipsson

Fact-checked against the cited medical and cost sources by the Clinics for Kings editorial desk·General information, not a clinician’s review — always consult a licensed doctor.

Dermal fillers: what to ask.

The questions that keep dermal fillers safe: who is injecting, what product, whether it can be reversed, and how a blocked blood vessel would be handled. We never name a clinic.

General health information, not medical advice, and not a substitute for a qualified doctor. Always consult a licensed professional before making any decision.

Published by Kings Hospitality LLC · 1314 E Las Olas Blvd, Fort Lauderdale, FL 33301, USA. Edited by Morten Andersen & Fredrik Filipsson. See our editorial standards & corrections policy.

£200 to £600

Indicative UK
per syringe

6 to 24 mo

Results last
by product and area

Rare

Serious harm
but vascular occlusion is real

The one honest thing

The single most important question is who holds the needle and whether they can treat a blocked blood vessel on the spot. That, not the price, is what keeps you safe.

Quick answer

Why these questions?

Dermal fillers are gels, most often hyaluronic acid, injected to add volume or smooth lines. In trained medical hands they are low risk and, for hyaluronic acid, largely reversible. The rare but serious danger is filler entering a blood vessel and cutting off blood supply, which can damage skin and very rarely affect sight. So the questions that matter are who is injecting, what product and how much, whether it can be dissolved, and whether the clinic can manage an emergency.

This page expands the questions from the main guide. It is general information reviewed in June 2026, not a personal treatment plan. Costs are indicative and vary.

The questions in depth

Ask all six, in writing.

Someone unqualified injecting, no antidote on site, and pressure to buy several syringes are the warning signs that matter most. Use these to judge any clinic you are sent.

Who is injecting, and are they a registered medical professional?

In many places almost anyone can inject filler. Ask the injector’s clinical qualification and registration, how long they have worked with facial anatomy, and confirm you can verify it. Anatomy knowledge is what prevents the serious complications.

What product, and is it hyaluronic acid?

Ask the exact brand and type. Hyaluronic acid fillers can be dissolved if something goes wrong. Permanent and semi permanent fillers cannot, and problems with them are far harder to fix. Know what is going into your face.

How much, where, and why?

Ask how many syringes, in which areas, and the reason for the plan. More is not better. A natural result usually uses less than people expect and is built gradually over time.

Can it be reversed, and is hyaluronidase on site?

For hyaluronic acid, the antidote hyaluronidase dissolves it. Ask whether the clinic keeps it on the premises and is trained to use it immediately, because in a blocked vessel minutes matter.

How would you handle a vascular occlusion?

A clinic should be able to describe, without hesitation, how it recognises and treats filler blocking a vessel. Vague reassurance that it never happens is a warning sign, not comfort.

What is the aftercare and the follow up plan?

Ask what to expect for swelling and bruising, what to avoid, and crucially who you contact if something changes days later. When treated abroad, sort out who handles a delayed problem before you book.

The warning signs

When to walk away.

Anyone but a medical professional injecting

If the person injecting cannot show a clinical qualification and registration, walk away. This is the factor most linked to serious harm.

No hyaluronidase on site

Without the antidote and the training to use it at once, a blocked vessel cannot be treated fast enough. That gap is not acceptable for facial filler.

Pressure to buy multiple syringes

Selling volume, deep discounts, and a full face in one sitting points to a sales target, not a careful plan.

Get Matched with a vetted clinic

Now you know what to ask, compare safely.

Send one brief and we route it to vetted clinics with medical injectors who answer these questions clearly. They return tailored plans and all in prices. You choose, with no pressure.

Free and no obligation. Accredited clinics only. We never sell your details.

How we make money: the guides are free and no clinic can pay to be named, ranked or recommended. We never name clinics. Get Matched is an optional service that helps keep the guides free and independent of any one clinic; using it is always your choice and you are never charged. How this works.

Common questions

The things everyone asks.

Are dermal fillers safe?

In trained medical hands, generally yes, with mild swelling or bruising the usual outcome. The rare serious risk is filler entering a vessel, which is why the injector’s skill and the clinic’s emergency readiness matter most.

Can filler be dissolved?

Hyaluronic acid filler can be dissolved with hyaluronidase. Permanent and semi permanent fillers cannot, which is one reason hyaluronic acid is often preferred.

How long do fillers last?

Indicatively six to twenty four months depending on the product and area, with lips at the shorter end and structural areas longer. Figures reviewed September 2025.

What is the most dangerous area?

Areas around the nose, between the brows, and under the eyes carry higher risk because of the blood vessels there. These need particular anatomical skill.