Meet your Specialist Orthodontists

Board Certified Members of the Australian Society of Orthodontists.

Professor Tan and Dr. Katie are registered Specialists with the Australian Dental Board with additional certification by the Australian Society of Orthodontists. Our training, together with more than 30 years of experience, assures you of a successful treatment outcome and achieving the best smile possible.

Our goal is to give you a smile and a bite that allows you to chew better, improve your speech, and light up your face when you smile.

​Treatment plans are tailored to you as an individual, based on your needs and diagnoses. You will never be sold devices with dubious claims of faster tooth movement, or the ability to improve your jaw growth, or to possess the "latest, cutting edge" technology.

​We work together as a team, and we look forward to your questions during your treatment journey. 

Prof. Tan and Dr. Katie consult at both Bentleigh and Wodonga clinics.

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Professor Seong-Seng Tan
MDS (Adel), FRACDS, MRACDS(Orth),DPHIL (Oxford)

Prof Tan. obtained his specialty training at the University of Adelaide (MDS) with additional dental degrees (FRACDS, MRACDS (ORTH)) from the Royal Australasian College of Dental Surgeons. Following this, he was awarded a Doctorate (DPHIL) from the University of Oxford, and developed his scientific research techniques alongside Nobel Prize winner Gerald Edelman at Rockefeller University, New York.

On top of being an orthodontist, he also heads a research laboratory on the genetics of brain diseases at the University of Melbourne. He has published over 100 peer-reviewed scientific papers and is very familiar with the evidence-based practice of dentistry. He is recognized as a Senior Principal Research Fellow with the Australian National Health & Medical Research Council. For his contribution to research in Australia, he was awarded the Amgen Australia Medal (1997) and the Special Achievement Award by the Australian Dental Association Vic Branch (2012).

Prof Tan is also an Adjunct Professor at the University of Queensland, and a visiting Professor to the National University of Singapore. 

Prof Tan enjoys being able to provide evidence-based treatment for patients of all ages. He is a master of Twin-Block therapy and has successfully treated over 30,000 smiles and counting throughout his long career. He is known in the community his fast treatment times and broad smiles.

In your first visit with Prof Tan, you will be given an explanation of what causes your orthodontic problems, how to solve it, and what kind of orthodontic treatment appliances are available to you. Models and previously treated cases will be available to help you visualize your final result. A report will be sent to you to help you make your decision about your teeth and smile.


Dr Katie Xu

BDSc(Hons) Melb

DCD(Orth) Melb

Dr. Katie Xu is a dual-qualified Orthodontist and Dentist.


She obtained her general dentistry degree from the University of Melbourne graduating with first-class honors and receiving numerous scholarships and awards including the Cato Graduate Scholarship and the Des Crack Memorial Prize for the highest mark in Paediatric dentistry and Orthodontics.

Dr. Katie practiced as a general dentist for many years serving the wider Melbourne community before undertaking further study in the competitive 3-year Master's Degree in the Doctor of Clinical Dentistry specializing in Orthodontics at the University of Melbourne. She has presented at numerous national orthodontic conferences and has research publications in the Australian Orthodontic Journal.

Her special interests include early preventative treatment to help the developing adult teeth naturally come into alignment, orthopedic treatment to help reduce the need for dental extractions and jaw surgery in the future. She has completed her Master's Thesis on the management of dental ankylosis and has an in-depth understanding of this condition.

She provides aesthetic orthodontic treatment options including Invisalign, clear aligners, internal braces, and a combination of different treatment approaches. She works collaboratively with your family dentist to provide the best possible smile and facial outcome for you. 

Dr. Katie will offer you treatment options that fit your lifestyle, expectations, and budget.


In your first visit, you will have a comprehensive assessment, set of photos and a 3D scan of your teeth. She will often provide 2-3 different options including comprehensive treatment and also express treatment for those with time limitations. You will have the opportunity to ask any questions you like. A comprehensive orthodontic report will be emailed to you within 2 weeks highlighting her findings, treatment plan, and relevant information.

Dr. Katie is fluent in Mandarin Chinese, please advise reception if you wish to converse in Chinese instead.


Why see a specialist Orthodontist for Orthodontics treatment?

Orthodontics is more than just braces and wires. It is the study of human facial growth and development, bone and cellular biology, physics, material science, surgical training, digital integration and having an eye for aesthetics.

An Orthodontist solely provides orthodontic treatment and does not provide any fillings, cleaning, teeth removal, or general dentistry treatment.

To become an Orthodontist in Australia, you must first graduate with a general dental degree with high marks. Study for at least 12 months to sit another rigorous examination post-graduation, All this to be eligible to apply to one of the esteemed programs. Entry to the program is extremely competitive with only 4 candidates selected per year, per state.

The program is a 3 years FULL-TIME master's degree with 3 years of clinical experience in real clinics and real patients, with over 30,000 hours of teaching time over the 3 years. Students are expected to perform at the highest caliber and an in-depth understanding of everything and anything related to orthodontics. After graduating, our Orthodontists continue to devote a large portion of their time to purely focusing on Orthodontics, including the latest evidence, treatment protocols to give you the best possible treatment,

A family dentist on the other hand does not undergo such rigorous training. Orthodontics is not taught as part of the general dentistry degree, and dentists often attend short courses to learn about orthodontics. These courses vary hugely in how comprehensive they are, some are weekend courses while others are part-time 3 years.


It is often worthwhile asking your dentist about their qualifications, what type of further learning they have done, and experiences before starting treatment. Dentists can often provide satisfactory treatment for simpler cases, however, it is often hard to tell what a simple case is without a proper understanding of orthodontics.

Having your treatment done by a specialist, qualified Orthodontist means you are in safe hands.

You will find our pricing to be extremely competitive, with interest-free payment plans and HiCAPs avaliable.