Meet the health professionals at our practice
Dr Stephen Greeff
Dr Greeff graduated at the University of Pretoria, South Africa. He has been in private practice for over 30 years with extensive experience in general dentistry and minor oral surgery.
Dr Greeff relocated to Australia in 2011, where he settled with his family in Adelaide.
Dr Theodore Costa
Dr Theodore Costa graduated at the University of Sydney and, later, Charles Sturt University, where he experienced the great sights of New South Wales. On graduating, he eagerly moved back to South Australia, and has been working in Modbury ever since. Theodore has a calming and gentle approach to dentistry and takes pride in offering his patients the best possible care.
Dr Theodore Costa actively participates in continuing education and has a passion for general dental practice. Out of the practice, he is a busy family-man and Sci-Fi enthusiast.
Dr Nisal Gunawardena
Dr Gunawardena graduated at the University of Adelaide and has been practicing at Tea Tree Dental since the start of 2020. He has a passion in all facets of general dentistry and thoroughly enjoys working alongside patients to provide quality treatment. Nisal will work through all treatment options with patients to achieve the best possible result with a commitment to excellence, care and innovation.
Outside of dentistry Nisal has keen interests in sports, travelling and socialising with friends.
Dr Yu Xiu Wong
Dr Yu Xiu graduated with a Bachelor of Dental Surgery from the University of Adelaide. With her friendly and compassionate nature, she is committed to providing her patients with positive dental experiences at the highest levels of care. Yu Xiu enjoys all aspects of dentistry but has a particular interest in preventative and restorative dentistry, advanced prosthodontics (crowns and denture work) and oral surgery. She genuinely enjoys her career and this is reflected by her willingness to constantly refine her dental skills through further study.
Outside of dentistry, Yu Xiu enjoys spending quality time with her friends and family, is an avid hiker and has currently taken on a new hobby with collecting Lego sets.
Yu Xiu is trilingual and fluent in English, Mandarin and Malay and looks forward to meeting you!
Jodie Billinger (hygienist)
Since graduating high school in 2012, Jodie has been involve in the Dental Industry. Originally working as a Dental Assistant before graduating as a Hygienist, she has always been extremely passionate about helping people and promoting good oral health.
Throughout Jodie’s career she has enjoyed volunteering overseas in Timor-Leste and Nepal, providing dental care to the local communities. Outside of the practice you can find Jodie enjoying the outdoors: camping, playing sport and walking her dog Zoe.
Liezl Greeff (hygienist)
Liezl graduated from the University of Pretoria in South Africa. She has worked in general dental and orthodontics as a Dental Hygienist for over 20 years. Her passion for working and helping people led her to complete her Diploma in Counselling through the ACA in 2019.
Throughout Liezl’s career she has enjoyed promoting the importance of good oral health. Outside of the practice she enjoys spending time with her family and two dogs.