Meet Our Team

Dr Dawie De Villiers: Dentist
Dental ON Gray 


Dr Dawie de Villiers graduated from the University of Stellenbosch in 1989 which gives him over 30 years experience in the dental industry.

He has completed numerous post-graduate certificates and diplomas. He has a special interest in Reconstructive Aesthetic & Cosmetic dentistry. 

He is passionate about his patients & people in general and continuously build lifelong connections wherever he goes. He runs a practice that is friendly, professional and  on the leading edge of technological advances in the dental industry.

When Dr De Villiers is not practicing dentistry, he keeps himself busy with entrepreneurial opportunities and creating new ways to enhance the lives of the people around him.  He is the complete family man and loves his home and music! 


Dr Heinrich Dippenaar: Dentist
Dental ON Gibb & Gray

circle-cropped-4Dr Heinrich Dippenaar has a special interest in Endodontics (root canal therapy). He is at Dental ON Gray in Knysna as well as at our Plett practice, Dental ON Gibb.

Dr Dippenaar lectures nationally as well as internationally.  He completed his dentistry degree in 2002 through Stellenbosch University and his Post-Graduate diploma in Endodontics (Root Canals) thereafter.  His fields of interest are: complex Root Canal treatments; Aesthetic Dentistry and to see those beautiful before and afters with Digital Smile Design Dentistry.

With his passion for the dental industry and technological innovation, he aims to change the ideas behind “going to the dentist” for the better and to make your visit to him, as pleasant as possible.

Dr Daniël Rossouw: Dentist
Dental ON Gray & Gibb

circle-cropped-3Dr Rossouw graduated from the University of Pretoria with a Bachelor of Dental Surgery where he received awards for top student in Endodontics (root canals); Removable Prosthetics and Periodontics. He then broadened his scope by completing a post-graduate certificate in Oral Implantology.

Daniël is passionate about all disciplines of dentistry but has a special interest in paediatric and geriatric patients. Daniël has also mastered the Nitrous Oxide method of sedation which will make your child’s visit to the dentist a much better experience. Read more about Nitrous Oxide in our “Sedation” section.

He is a perfectionist of note and finds satisfaction in helping other people where he can. His hobbies include travelling, photography and playing the saxophone.

Esmé Wallace: Oral Hygienist
Dental ON Gray

circle-croppedEsmé is an experienced Oral Hygienist and has more than 27 year experience in her field. Her motto is “prevention is better than cure” and considers this the key to oral health and oral hygiene. Prosthodontics, Periodontics and Orthodontics are all important disciplines when dealing with oral hygiene challenges. 

Esmé is very passionate about what she does and will leave you with the best tips and tricks to take care of your Oral Hygiene at home, where it is most important. Demonstration of the correct ways of brushing, flossing, tongue scraping and correct dietary advice, is necessary to all our patients. 

We advise at least a twice a year thorough Oral Hygienist cleaning to all our patients. 

Kathryn Talken: Oral Hygienist
Dental ON Gibb & Gray

circle-cropped-9Katherine has been practicing Oral Hygiene for 12 years. She enjoys interacting with her patients and always treat them in a friendly and comfortable manner. She believes the more gentle she is, the less pain and the more likely a patient will look forward to their next oral hygiene visit.

Katherine is very compassionate and a great asset to our team!


Yolanda Rosslee: Practice Manager
Dental ON Gray

circle-cropped-7Yolanda has been with Dental ON Gray since 2012 and her role has constantly evolved and matured during her time at the practice. Her dedication, loyalty and competency in all that she does, make her an impeccable practice manager, ensuring that everything runs smoothly from day to day. 

She manages, maintains and oversees all administrative duties. Her ability to handle multiple tasks at once makes her an irreplaceable asset to our team. 

Debbie Oosthuizen: Front Office Manager
Dental ON Gray


Debbie has been in the Dental Industry since 1993. Patients ask for her by name! 

She always welcomes you with a friendly face and her many years of experience in a Dental Surgery have made her one of the most knowledgeable members in our team. S

he is an all-round employee and is able to fill most roles here at the practice. Debbie can always be counted on when needed with a positive attitude.

Irene Leah Willemse: Receptionist
Dental ON Gray


Irene will be the first BIG smile you see when entering the practice. She is very intelligent and efficient; hands-on and always friendly!

She handles all of the appointments and some of the administration.

Irene brings a wonderful serenity and calmness to the practice to our patients as well as ourselves.


Edwina Stevens: Dental Assistant for Dr De Villiers

Edwina is Dr De Villiers’ assistant and has been at Dental ON Gray for more than 8 years giving her the well deserved title as the head Dental Assistant. 

She takes pride in ensuring all our surgeries are fully equipped and stocked with the necessary supplies needed to keep the practice running smoothly. She is always willing to teach and mentor her fellow dental assistants.   She is kind, reliable and highly competent & skilled in her field. 


Ilze Dippenaar: Receptionist and occasional Assistant for Dr Dippenaar 
Dental ON Gibb  


Ilze has over 27 years of experience as a Dental Assistant which makes her a great asset to Dr Dippenaar and the rest of the Dental ON team. She loves children and her smile and bubbly personality brings a calming effect to all children and patients.

She loves what she does because of the rewarding factor that a new crown brings to a patient’s confidence and smile and to see how their faces light up when they see the ‘after’ picture in the practice mirror. 

Anchin April: Dental Assistant for Dr Rossouw 


Anchen brings an atmosphere to our practice that we love! She is very sweet with our patients and always eager to help out where she can.

In her off days, Anchen loves to spend time with her family and friends around a braai.


Yvette De Villiers: Practice Co-ordinator
Dental ON Gray & Gibb

Yvette is a qualified Midwife and Mental Health nurse and has acquired years of experience in Intensive Care and Oncology at Tygerberg Hospital. 
She is very passionate about the practice and is continuously seeking ways to better and improve our systems, look and ambience at Dental ON Gray and Dental ON Gibb.


Cynthia Show: Specialist Cleaning
Dental ON Gray

circle-cropped-16Cynthia is responsible for keeping our surgery in a pristine condition!
You will never find her without a smile on her face. She is very committed and has a ‘can-do’ attitude. 


Our Visiting Dentists

Dr Luzaan Van Zyl: Visiting Orthodontic Dentist 

Dental ON Gray & Gibb 

circle-cropped-13Dr Luzaan van Zyl obtained her BChD degree Summa Cum Laude from the University of the Western Cape. She also completed her post graduate diploma in Interceptive Orthodontics Cum Laude from UWC; a postgraduate diploma in Progressive Orthodontics with Highest Honours from McGann Postgraduate School in USA, as well as a post graduate diploma in Orthodontics from the College of Medicine of South Africa. Thereafter she obtained her Masters MSc degree in Orthodontics from her alma mater UWC.  Dr van Zyl has been with Dental on Gray since March 2016 and as a visiting dentist performs all orthodontic services.

Dr Johnny De Lange: Visiting Medical Doctor & Dentist (Surgical Cases) 
Dental ON Gray & Gibb


Dr Johnny de lange is a dual qualified practitioner who obtained both his BChD and MBChB degrees Cum Laude from the University of Pretoria. Furthermore he obtained two post graduate diplomas in Oral surgery one from the College of Medicine of South Africa and the other from his alma mater UP.

He then enrolled for an 18 month hands on Implantology course to augment his oral surgery background.

As a visiting practitioner he performs most of the oral surgery needs at Dental on Gray on a locum basis whilst he currently works as an Intern Doctor at George Regional Hospital.



Dental ON is a highly skilled team of Dentists and Dental Hygienists offering a wide range of Dental services in Knysna and Plettenberg Bay on the Garden Route, Western Cape, South Africa .

Get in Touch

Dental ON Gray 
15 Gray Street, Knysna, Western Cape, South Africa 
Tel: (044) 382 1535 


Dental ON Gibb
30 Monk’s View, Gibb Street, Plettenberg Bay, Western Cape, South Africa
Tel: (044) 533 2044

Opening Hours

8:00 am – 5:00 pm
8:00 am – 5:00 pm
8:00 am – 5:00 pm
8:00 am – 5:00 pm
8:00 am – 5:00 pm

We are Closed on Public Holidays.

In the case of an Emergency, please call the practice number to be redirected.