Can a Dental Hygienist Do Fillings or Only Preventive Work?
It is a reasonable question and the answer is not obvious from the waiting room. Hygienists, therapists, and dentists all work chairside in similar surroundings, wear similar clothing, and use similar equipment. Patients understandably assume the roles overlap more than they do.
In the UK, the General Dental Council defines what each registered group may do. For dental hygienists, that scope is substantial but does not include placing fillings. Dental therapists — a separate registration category, though many people hold both — do have a restorative scope.
This article sets out where the boundaries sit, why prevention and restoration are more connected than they appear, and how the dental team works together in practice.
Can a Dental Hygienist Do Fillings?
Is my hygienist allowed to fill a cavity?
No. Placing fillings falls outside the GDC Scope of Practice for dental hygienists. A hygienist who identifies a suspected cavity will record the finding and refer you to the dentist, who diagnoses and treats it. This is not a comment on individual ability — it is a defined regulatory boundary. Dental therapists, who complete different training and hold a different registration, are permitted to place direct restorations in both adult and child teeth within their own scope. Many clinicians are dually qualified as hygienist and therapist, which is one reason the roles are easily confused. If you want to know, simply ask which registration the person treating you holds.
What the GDC Scope of Practice Says About Fillings
The GDC publishes a Scope of Practice document setting out what each registrant group can do, and what additional skills they may acquire through further training.
Dental hygienists focus on periodontal health and prevention. Their core scope includes periodontal assessment and treatment, scaling and root surface debridement, applying preventive materials, taking radiographs where trained, giving local infiltration analgesia where trained, and providing oral health education.
Restorative procedures — preparing cavities, placing fillings, treating decay — are not part of that scope. They sit with dentists, and within defined limits with dental therapists.
The reason is not arbitrary. Restorative treatment requires diagnostic judgement about pulp status, radiographic interpretation for restorative purposes, and treatment planning decisions that carry different professional responsibility. Registrants are also bound by GDC Standards to work only within their competence and to refer appropriately.
Periodontal Assessment and Treatment
The core of the role. Recording pocket depths, bleeding on probing, recession, and mobility, interpreting bone levels, and diagnosing and treating gingivitis and periodontitis. Root surface debridement to clean beneath the gumline is a substantial clinical undertaking and forms the main non-surgical treatment for gum disease.
Professional Cleaning
Removing calculus and biofilm from tooth surfaces above and below the gum, plus stain removal. This is what most patients think of as a hygiene appointment, and it is only part of the picture. See dental hygiene for what a visit involves.
Preventive Applications
Fluoride varnish, fissure sealants, and desensitising agents all fall within scope. Sealants in particular can meaningfully reduce decay risk in the grooves of back teeth, especially in children and teenagers.
Oral Health Education
Individualised advice on brushing technique, interdental cleaning, dietary sugar frequency, and smoking. Genuinely tailored advice — matched to your dexterity, your restorations, and your habits — changes outcomes more than generic instruction.
Additional Trained Skills
Depending on training, hygienists may also take radiographs, administer local infiltration analgesia, take impressions, and apply certain whitening materials to a dentist's prescription.
Why Preventive and Restorative Care Are Connected
It is tempting to see prevention as the soft option and restoration as the real dentistry. Clinically, the relationship runs the other way.
Dental decay is a biofilm-driven disease. Bacteria metabolise fermentable carbohydrates and produce acid; enamel demineralises when the pH drops and remineralises when it recovers. A cavity is what happens when that balance tips towards loss for long enough. Placing a filling deals with the damage but does nothing about the process that caused it.
That is why a patient who has a filling placed and changes nothing else tends to return with another cavity elsewhere. The preventive work — reducing sugar frequency, improving plaque removal, applying fluoride, sealing vulnerable grooves — is what alters the disease process itself.
Periodontal disease works similarly. Bacterial biofilm at the gum margin triggers an inflammatory response, and in susceptible people that response damages the supporting bone. Bone lost this way does not come back. Professional debridement and daily home care control the driver.
Neither of these is a reason to skip restorative treatment when it is needed. They are a reason to take the hygienist appointment as seriously as the dentist appointment.
How the Dental Team Works Together
The dentist carries out examinations, diagnoses decay and other conditions, plans treatment, and provides restorative, endodontic, and surgical care.
The hygienist delivers periodontal care and prevention, monitors gum health in detail, and refers findings that fall outside their scope.
The therapist, where the practice has one, provides direct restorations and some other treatments within their scope, generally on the dentist's prescription.
Communication is what makes this work. A hygienist who spots a suspected cavity or a defective margin records it and passes it on, and in a well-run practice that reaches the dentist promptly rather than at your next routine visit. Urgent findings are escalated immediately.
When a Professional Dental Assessment May Be Needed
Arrange an appointment with a dentist if you notice:
• Sensitivity to hot, cold, or sweet that lingers after the stimulus is removed
• A visible hole, dark mark, or rough edge on a tooth
• Food consistently packing between the same two teeth
• Pain when biting on a particular tooth
• A filling that feels loose, rough, or has come out
• Gums that bleed regularly, or a tooth that has loosened or moved
• An ulcer or patch in the mouth that has not settled within about three weeks
Decay is often symptom-free until it is well established, which is why examinations at your recommended interval matter even when nothing hurts. Our dental check-up page explains what an examination covers.
Brush Effectively Twice Daily
Two minutes, fluoride toothpaste, and spit rather than rinse afterwards so the fluoride stays in contact with the teeth. Technique matters more than pressure.
Clean Between Your Teeth Daily
Interdental brushes sized correctly for your gaps, or floss where brushes will not fit. A significant proportion of decay starts between teeth where a brush cannot reach.
Reduce Sugar Frequency
How often you consume sugar matters more than the total amount. Each exposure produces an acid challenge, and constant grazing gives enamel no chance to recover.
Attend Regularly
Both examinations and hygiene appointments, at the intervals your team recommends based on your individual risk.
The NHS provides general guidance at nhs.uk/live-well/healthy-teeth-and-gums/take-care-of-your-teeth-and-gums/.
Key Points to Remember
• Dental hygienists in the UK do not place fillings — this sits outside their GDC Scope of Practice
• Dental therapists hold a different registration and can provide direct restorations within their scope
• Many clinicians are dually qualified, which is why the roles are often confused
• A hygienist who spots suspected decay records it and refers you to the dentist
• Hygienists diagnose and treat gum disease, apply preventive materials, and deliver tailored oral health advice
• Prevention addresses the disease process; restoration addresses the damage it has already caused
• You can ask which registration your clinician holds, and check the public GDC register
Frequently Asked Questions
1. What is the difference between a hygienist and a dental therapist?
They are separate GDC registration categories with different training. Hygienists focus on periodontal care and prevention. Therapists have a wider scope that includes direct restorations, some extractions of deciduous teeth, and pulp therapy in children. Many clinicians hold both registrations.
2. If my hygienist sees a cavity, what happens?
They record it, tell you, and refer you to the dentist. The dentist then examines the tooth, takes radiographs if needed, confirms the diagnosis, and discusses treatment options with you.
3. Can a hygienist give me a temporary filling?
Placing restorations is outside a hygienist's scope. If a filling has come out, you should be seen by a dentist. In the interim, a pharmacy temporary filling material is a reasonable holding measure.
4. Can a hygienist apply fissure sealants?
Yes. Sealants fall within the hygienist scope and are a well-established preventive measure for the grooves of back teeth, particularly in children and teenagers.
5. Does a hygienist appointment replace a check-up?
No. They examine different things. A hygiene appointment focuses on periodontal health and prevention; a dental examination covers decay, existing restorations, the bite, and soft tissue screening.
6. How do I check what someone is registered to do?
Every UK dental professional has a GDC number and appears on the publicly searchable register, which shows their registration category. Asking directly is also perfectly acceptable.
Conclusion
Dental hygienists cannot place fillings, but describing their role as "only preventive work" undersells it considerably. Diagnosing and treating gum disease, carrying out root surface debridement, applying preventive materials, and delivering advice that genuinely changes behaviour are all substantial clinical contributions.
The more useful framing is that prevention and restoration address different parts of the same problem. A filling repairs damage; preventive care changes the conditions that produced it. Attending both types of appointment, at the intervals recommended for you, is what keeps the amount of restorative work needed down over time.
If you would like to discuss your oral health, you are welcome to book an appointment at Wimpole Dental, 22 Wimpole St, London W1G 8GQ, or call 020 7183 0692.
Dental symptoms and treatment options should always be assessed individually during a clinical examination.
Dental Disclaimer
This article is for general educational information only and is not professional dental advice, diagnosis, or a treatment recommendation. Information here is general and cannot replace an in-person assessment by a qualified, GDC-registered dental professional. Symptoms, suitability, fees, timelines, and outcomes vary according to individual clinical circumstances. If you have pain, swelling, or other concerning symptoms, seek prompt professional dental care. Always request a written treatment plan and cost estimate before proceeding with treatment.
Written Date: 20 August 2026
Next Review Date: 20 August 2027
Written by Jack Button · reviewed by Dr Reza Davari, GDC 302422
This article is general information, not personal clinical advice. For a diagnosis and a plan tailored to you, book a consultation with a GDC-registered dentist.
Related treatments at our Wimpole Street practice
