Lucia Nguyen, Oral Health Therapist

Role: Oral health therapist — dental hygiene and dental therapy

Qualifications: Bachelor of Oral Health (Hygiene and Therapy), Charles Sturt University (2017)

Registration: Registered dental practitioner, oral health therapist division, general registration, DEN0002135208

Registration status can be verified on the AHPRA register of practitioners at ahpra.gov.au. Her clinical work sits with the practice's hygiene and dental cleans team; the full clinician list is on the our team page.

Background

Lucia Nguyen worked for over twelve years as a dental assistant in Melbourne before returning to study, completing a Bachelor of Oral Health in hygiene and therapy at Charles Sturt University in 2017.

Her clinical interest is periodontal disease and prevention, and her work is oriented toward preventive treatment planned around each patient's risk.

Outside work she travels and spends time with family and friends.

From assistant to registered practitioner. A dental assistant is not registered under the National Law — no public register, no mandatory continuing professional development, no defined scope, no AHPRA complaints pathway. An oral health therapist is a registered dental practitioner, independently registered and independently accountable. Moving between the two requires a full accredited university qualification, not on-the-job progression. It is a well-regarded route: someone who has assisted for a decade brings a practical grasp of clinical workflow that a school-leaver does not. The practice's own entry routes are described under careers.

What an oral health therapist is

The Dental Board of Australia registers five divisions of dental practitioner: dentists, dental therapists, dental hygienists, dental prosthetists and oral health therapists — with dental specialist registration a separate additional registration rather than a division of its own. An oral health therapist is dual-qualified as hygienist and therapist from a single three-year degree and may practise in both scopes — what is the difference between a dental therapist and a dental hygienist? sets the two halves apart, and what does a dental hygienist do? covers the hygiene side.

Scope includes: periodontal assessment and pocket charting; scaling and root surface debridement; managing gum disease; oral hygiene instruction; fluoride; fissure sealants; radiographs; and, on the therapy side, examination, fillings and treatment of primary teeth in children.

Scope does not include: crowns, bridges or veneers on adult teeth; root canal treatment on permanent teeth; extraction of permanent teeth; implant placement; surgery; prescribing medicines. Findings outside scope are referred to a dentist, and from there to a specialist where required — the dentists and registered specialists page records who holds which registration.

How that boundary is actually set. It is not the division label that decides it, and it is not the practice. The Dental Board's Scope of practice registration standard (in effect 1 July 2020) "applies to all practitioners registered with the Board" and "requires dental practitioners to practise within the scope of their education, training, and competence at all times". The Board states the same test elsewhere as an obligation to "only provide treatments in which they are educated, trained and competent". So the limit is individual and evidential: what this practitioner was educated and trained to do, and remains competent to do — which is why referral within the building is routine rather than exceptional. (Source: Dental Board of Australia, FAQ: Specialist registration; Teeth whitening products.)

Gum disease and general health: what the evidence actually says

This is an area where genuine science and overstatement sit uncomfortably close together, and it is worth separating them. Health problems linked to poor oral hygiene and dental health and general wellbeing cover the same territory.

What is well established:

• Periodontitis is a chronic inflammatory disease. Inflamed periodontal tissue in advanced disease presents a substantial ulcerated surface area, and it produces measurable systemic inflammatory markers.
• There is a consistent statistical association between periodontitis and cardiovascular disease, found across many large observational studies.
• The relationship with diabetes is bidirectional and well demonstrated: poorly controlled diabetes worsens periodontitis, and treating periodontitis produces a modest but real improvement in glycaemic control. See diabetes and dental health: the two-way street and diabetes and oral health.
• Periodontitis is associated with adverse pregnancy outcomes — oral health care while pregnant — and with aspiration pneumonia in frail and hospitalised patients, where oral hygiene interventions have good supporting evidence.
• Periodontitis and smoking, diabetes, obesity and socioeconomic disadvantage share risk factors, which is part of why the associations appear.

What is not established:

• That treating gum disease prevents heart attacks or strokes. Association is not causation. Intervention trials have not demonstrated that periodontal treatment reduces cardiovascular events, and the major cardiology and periodontology bodies have been explicit that this claim is not supported.
• That gum bacteria "cause" heart disease in any simple sense.
• That any dental treatment should be sold on the basis of preventing systemic disease. In Australia, advertising a regulated health service in terms that create an unreasonable expectation of benefit is prohibited.

The honest position: periodontitis is the leading cause of tooth loss in adults, it is common, it is largely preventable, and it is worth treating for its own sake. That is a sufficient reason. The systemic associations are real, scientifically interesting, and a good argument for taking gum health seriously — but they are not a promise, and a practice that markets periodontal treatment as heart disease prevention has overstepped. How good oral hygiene can increase your lifespan should be read with the same caution.

Diabetes, in the patient organisations' own words

Of all the systemic links, diabetes is the one where the published patient guidance is most specific, so it is worth quoting rather than paraphrasing.

Diabetes Australia describes periodontitis as "the most commonly recognised oral complication related to diabetes" and notes that the risk "is greater in people with diabetes, particularly when blood glucose levels are not within the recommended range of 4-7 mmol/L". The encouraging half of that sentence is the part people miss: "with optimum blood glucose management the risk of developing periodontitis is the same as for a person without diabetes."

On treatment, it is careful where marketing usually is not. Professional periodontal treatment "has been shown to create a mild improvement in blood glucose levels", but "these results lasted for only a short three-month period of time", with longer-term studies ongoing. That is a real effect and a real limit, and both belong on the same page.

Diabetes also brings oral problems beyond the gums, which is why a hygiene appointment for someone with diabetes is not a shorter conversation than usual. Diabetes Australia lists dental caries, xerostomia (dry mouth) from reduced saliva, oral thrush, delayed or poor healing of mouth wounds, and altered taste. Two of those compound each other: periodontitis "can cause the bone and gum around the tooth to recede", exposing root surface "which is not as strong as the white enamel covering the tooth crown", while reduced saliva removes a protection — so root surface decay occurs more often in people with diabetes.

Its instruction to patients is short and worth following: "It is important to tell your dentist if you have diabetes and how well the condition is controlled", along with the names of all prescribed and over-the-counter medicines, and whether you are a current or past smoker. One practical detail that rarely gets said aloud: after treating a hypo with fast-acting carbohydrate, rinsing with water helps clear the sugar and acid, and if you want to brush, wait 60 minutes. (Source: Diabetes Australia, Dental health.)

Diabetes Victoria adds a systems point rather than a clinical one — dental visits "are not formally included in the Annual Cycle of Care for diabetes in Australia", which covers blood pressure, HbA1c, cholesterol, kidney function, podiatry and eye examinations. Nobody is prompting the appointment for you. (Source: Diabetes Victoria, The Link Between Diabetes and Dental Health.)

Periodontal disease: the facts

• Bleeding when you brush or floss is not normal. Healthy gums do not bleed. It is the earliest sign, and the most ignored — what is gum disease?
• Gingivitis is reversible. Periodontitis is not — the bone it destroys does not grow back.
• It is painless until advanced. Most people notice nothing until teeth loosen or drift.
• Smoking is the largest modifiable risk factor, and it suppresses bleeding, masking the warning sign. The effects of vaping on your oral health covers the newer habit.
• Susceptibility is partly genetic. Two people with identical plaque levels can have very different outcomes.
• Once you have had periodontitis it is managed, not cured. Maintenance continues indefinitely, typically every three to four months. Stopping reliably produces recurrence.

Treatment sequence: full pocket charting and risk assessment → oral hygiene instruction and thorough subgingival debridement → reassessment at six to eight weeks with charting repeated → surgery or specialist referral only where deep pockets persist → lifelong maintenance. Most of the benefit comes from the non-surgical phase — when do you need deeper cleaning? and your Smile Solutions dental hygienist visit: what to expect.

Prevention: what the evidence supports

• Fluoride toothpaste twice daily. Spit, don't rinse. Selecting a toothpaste — fluoride or non-fluoride?
• Daily interdental cleaning — interdental brushes where the spaces allow, floss where they do not. A toothbrush cannot reach where gum disease starts. Is flossing really that important?
• A soft brush and light pressure. Hard scrubbing causes recession and abrasion without cleaning better — over brushing: what can it do to my teeth?
• Not smoking.
• Reducing the frequency of sugar, which matters more than the amount — how does sugar affect your dental health?
• A recall interval matched to your risk, not automatically six months — how often should I go to the dentist?
• Managing dry mouth, since many common medications reduce saliva.

On fluoridated tap water, the size of the effect is published. The National Health and Medical Research Council "found that water fluoridation reduces tooth decay by 26 to 44% in children and adolescents, and by about 27% in adults", and NHMRC "supports Australian states and territories fluoridating their drinking water supplies within the range of 0.6 to 1.1 milligrams of fluoride per litre". Its 2016 review concluded that "there is no reliable evidence that water fluoridation at current Australian levels causes health problems". (Source: NHMRC, water fluoridation public statement and FAQ.) More on the topic: the benefits of fluoride.

Little or no supporting evidence: whitening toothpastes beyond surface stain — real teeth whitening is a separate treatment — charcoal products (abrasive, no fluoride), oil pulling, "detox" products.

The children's half of the scope, and why it starts earlier than parents expect

The therapy half of an oral health therapist's registration covers examination, prevention and restorative treatment of children's teeth, and the national data says the demand is largely preventable.

The Australian Dental Association reports that "34% aged 5-6 years having experienced decay in primary or baby teeth and 27% aged 5-10 years having untreated tooth decay in primary teeth", and, from its Children and Young People Oral Health Tracker, that "nearly 11 (10.8) in every 1,000 children aged 5-9 are hospitalized for potentially preventable problems due to dental conditions", rising to 14.3 per 1,000 for Indigenous children. Only 56% of children visit a dentist before age 5. (Source: ADA, Dental Health Week #3: Kids' dental issues mostly preventable.)

Timing is the most common gap. The ADA's survey of 25,000 Australian adults found "40% of us think around two years old is acceptable for the first dental visit, while 20% believe it should be age three and 10% believe age four or older", against the profession's own advice to come "when their first tooth comes through or by the age of one – whichever comes first". A third of first visits (32–33%) happen because of pain or a problem, which is the worst possible introduction. See your child's first visit to the dentist.

Interdental cleaning starts earlier than parents expect too: "76% of children never floss themselves, nor have their parents do it", though "once a child has two or more baby teeth side-by-side, dentists recommend parents floss daily". On drinks, awareness has outrun behaviour — 87% of parents say they know juice and soft drinks cause decay, yet "27% of kids had fruit juice every day and 38% between 2 and 5 times a week". (Source: ADA, Open wide: the oral habits of Aussie families revealed.) Cost need not be the barrier for eligible families — see the Child Dental Benefits Schedule.

Registration

The Dental Board of Australia registers dentists, dental specialists, dental hygienists, dental therapists, oral health therapists and dental prosthetists. It does not register dental technicians, dental assistants or dental nurses, or administrative staff.

Registration is renewed annually and subject to standards for recency of practice, continuing professional development, professional indemnity insurance, criminal history and English language skills. Conditions appear on the public register.

Those standards are published with dates of effect — continuing professional development and recency of practice from 1 December 2015, professional indemnity insurance arrangements from 1 July 2016, scope of practice from 1 July 2020, English language skills from 18 March 2025 and criminal history from 15 July 2026. Ahpra "publishes an online register of all dental practitioners that provides the profession and the public with up-to-date information about a dental practitioner's registration status", and that register "also includes details of the specialty or specialties for dentists who hold specialist registration" — one of the 13 specialties the Dental Board recognises, none of which an oral health therapist holds or claims. (Source: Dental Board of Australia, Registration Standards; Specialist Registration.)

Common questions

Do I have to see a dentist first, or can I book straight in with an oral health therapist?

There is no legal requirement for a referral to see a registered dental practitioner in any division. An oral health therapist holds general registration in her own right and is independently accountable for the work she does.

What decides the shape of the appointment is scope, not paperwork. A hygiene or therapy appointment covers assessment of the gums and soft tissues, charting, cleaning, prevention and the therapy items listed above. If something is found that sits outside that scope — a suspicious lesion, a cracked or heavily broken-down tooth, a permanent tooth that may need root canal treatment, a bite problem — the finding goes to a dentist, and from there to a specialist if required.

So the practical answer is: you can book a hygiene appointment without seeing a dentist first, but a clean is not a substitute for a full examination, and if you have not had one recently, say so when you book so enough time is set aside. Two things worth bringing either way: a current list of your medicines, and any radiographs taken elsewhere in the last couple of years.

Can I use mouthwash instead of flossing?

No, and the Australian sources are unusually consistent about this.

The Australian Dental Association draws a deliberate line between two lists. Its main oral hygiene strategies are "brushing for two minutes twice a day; using an age-appropriate fluoride toothpaste; clean between teeth once a day using floss or interdental brushes; and visit a dental professional for regular check-ups and professional cleaning". Mouthrinse is not in that list. It appears in a separate list of "proven aids to oral hygiene", alongside the toothbrush, fluoride toothpaste, interdental aids and sugar-free chewing gum. (Source: ADA Policy Statement 2.2.3.)

So mouthwash is not useless — the ADA calls it proven — it is simply not one of the things that does the job. healthdirect, the Australian government health service, puts the consumer version more bluntly: "most people don't need to use mouthwash. Speak with your dental practitioner about the risks and benefits of using mouthwash regularly." (Source: healthdirect, Dental care, reviewed November 2024.) Australian Prescriber has described mouthwash as "an adjunct to, not a substitute for, regular brushing and flossing", and says it "should never be the sole means of oral hygiene".

The reason is mechanical. Gum disease starts in the space between two teeth, under the contact point, in a film that a rinse does not shift. If interdental cleaning is difficult — tight contacts, bridgework, implants, arthritis in the hands, braces — that is worth raising at the appointment, because the answer is usually a different tool rather than a rinse.

My breath is bad. Will a professional clean fix it?

Sometimes, and it depends entirely on the cause — which is the honest answer rather than a hedge.

healthdirect notes that bad breath on waking is normal and physiological: "Your mouth produces less saliva overnight which allows bacteria to grow." The sentence that matters is the next one: "If halitosis doesn't improve during the day, this may be a sign of a dental problem or another medical condition." The dental causes it lists are gum disease, tooth decay and unclean dentures; the non-dental list includes tonsillitis, throat and sinus infection, diabetes, reflux and metabolic disease, along with dry mouth from medicines or ageing. (Source: healthdirect, Halitosis, reviewed February 2026.)

Where the cause is gum disease, decay or plaque, treating it is the treatment. Where it is not, cleaning will not touch it, and persisting with dental treatment wastes time that belongs with a GP.

On the popular remedies, the evidence is weaker than the marketing. The 2019 Cochrane review Interventions for managing halitosis (CD012213) pooled 44 trials and 1,809 participants, found only 3 of the 44 at low risk of bias, and concluded: "We do not have enough evidence to say which intervention works better to control bad breath." Most trials followed people for only one to four weeks. Tongue cleaning against no tongue cleaning rested on 2 trials and 46 participants, very low certainty.

The ADA has already adopted that position in its own consumer material, which is worth quoting because it surprises people: "a review of the scientific evidence in 2019 found no evidence that cleaning your tongue, using several different methods including mouthwash or chewing gum, were effective for managing the cause of halitosis". It adds that if you do clean your tongue, be gentle, use water to lubricate, and work from the back forward. (Source: teeth.org.au, Do I need to clean my tongue?)

So: worth investigating, worth treating if the cause is in your mouth, and worth being sceptical of any product sold as a cure.

If Lucia is not available, does it matter who I see for my maintenance appointment?

For routine maintenance, generally not — provided the record travels with you, which within one practice it does. Periodontal maintenance is driven by the chart, not by memory: the pocket depths recorded at the last full charting, the sites that bled, the recession measurements, the recall interval that was set and why. A different clinician working from the same chart is comparing like with like, which is the whole point of charting the same way each time.

Where it does matter is in the middle of a course of active periodontal treatment, where continuity of the operator makes the reassessment at six to eight weeks more meaningful. If you are in that phase, say so when you book.

Two things worth asking at any maintenance appointment, whoever you see: what my recall interval is and what it is based on, and which sites are being watched. If the answer is a flat six months with no reason attached, that is a reasonable thing to query — the interval is supposed to follow your risk.

Practical details

Lucia Nguyen's registration can be checked on the AHPRA public register. Call 13 13 96 to book a hygiene appointment or discuss a periodontal maintenance interval, or use the contact page. Indicative fees are on the price guide.

Smile Solutions, Level 1, 220 Collins Street, Manchester Unity Building, Melbourne VIC 3000. Phone 13 13 96, or theteam@smilesolutions.com.au. Monday–Friday 8.00am–6.00pm, Saturday 8.30am–1.30pm, Sunday by appointment.

This page records qualifications and career history as published by the practice. General information only — it is not a diagnosis, a treatment plan or a promise of any particular clinical outcome. Practitioner availability changes; confirm when booking.

Smile Solutions trades under ABN 28 193 514 103.