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Dr Chelsia Sim

Dr Sim Chelsia

BDS (Singapore) 
Cert Oral Medicine (San Francisco)
MS (Oral and Craniofacial Sciences) (San Francisco) 
Cert Oral and Maxillofacial Pathology (Iowa)

Senior Consultant

Academic Vice Chair, Education, ORH ACP

National Dental Centre Singapore

Specialty: Oral and Maxillofacial Surgery

Conditions Treated by this Doctor:
Apthous Ulcers, Bad Breath (Halitosis), Facial Nerve Pain (Neuralgias), Glossitis, Oral Blistering Diseases – Pemphigus, Pemphigoid, Oral Erythema Multiforme, Oral Lichen Planus, Oral Manifestations of Systemic Diseases (Oral GVHD, oral lesions of SLE, DLE, Sjogren’s syndrome), Oral Premalignant Lesions - Leukoplakia/Erythroplakia/Erythrleukoplakia, Xerostomia.

Clinical Appointments

  • Senior Consultant Oral & Maxillofacial Surgery Singapore General HospitalSingapore General Hospital
  • Senior Consultant Department of Oral & Maxillofacial Surgery National Dental Centre SingaporeNational Dental Centre Singapore


Dr Chelsia Sim is a Senior Consultant at the National Dental Centre Singapore, she graduated from NUS and obtained her Masters degree and advanced training in Oral Medicine at the University of California, San Francisco. Following that, she completed another residency in Oral and Maxillofacial Pathology at the University of Iowa. 

Currently she runs the Oral Medicine Unit, in the Department of Oral Maxillofacial Surgery at the National Dental Centre and is actively engaged in the surgical biopsy service at Singapore General Hospital. Dr Sim also teaches Oral &Maxillofacial Pathology to the dental undergraduates at National University of Singapore. 

Her clinical interests includes diagnosis and management of oral mucosal diseases including autoimmune mucocutaneous diseases such as lichen planus, pemphigus and pemphigoid, recurrent stomatitis, oral graft versus host disease, Sjogren’s syndrome, oral diseases related to HIV and other infectious diseases. She also treats patients with oral precancerous lesions with carbon dioxide laser.


  • Diplomate, American Board of Oral Maxillofacial Pathology – 2017 
  • Diplomate, American Board of Oral Medicine – 2013 
  • Fellowship in the American Academy of Oral & Maxillofacial Pathology – 2013 
  • Fellowship in the Royal College of Surgeons Edinburgh - 2013 
  • Certificate in Oral and Maxillofacial Pathology, University of Iowa – 2013 
  • Master of Science in Oral & Craniofacial Sciences, University of California, San Francisco – 2010 
  • Certificate in Oral Medicine, University of California, San Francisco – 2009 
  • Bachelor of Dental Surgery, National University of Singapore – 2005 

Professional Appointments and Committee Memberships

  • Clinical Lecturer, Faculty of Dentistry, NUS
  • Chairman, Infection Control Committee, NDCS (Jan 2018 – present) 
  • Chairman, Medication Safety Committee, NDCS (April 2015 – Dec 2017) 
  • Deputy Chairman, Infection Control Committee, NDCS (Jan 2015 – Dec2017) 
  • Chairman, Laser Safety Committee, NDCS (Jan 2014 – present) 
  • Chairman, Tissue Review Committee, NDCS (June 2017 – present) 
  • Clinical Lecturer, Faculty of Dentistry, NUS (2014 – present)


  • SingHealth Quality Service Award (Silver) – 2014 
  • Health Manpower development Plan (HMPD) Award, Ministry of Health, Singapore for Certificate in Oral Maxillofacial Pathology at University of Iowa – 2010 
  • Lester Burket Clinical Research Award, American Academy of Oral Medicine – 2010 
  • Case Report Presentation Award, American Academy of Oral Medicine – 2009 
  • Health Manpower development Plan (HMPD) Award, Ministry of Health, Singapore for Certificate in Oral medicine, University of California, San Francisco – 2007 

Research Interests

  • Epidemiology of oral lichen planus and its treatment, management of pre-malignant oral mucosal lesions and oral vesiculobullous diseases 
  • Quality of life of patients with chronic oral mucosal lesions 
  • Sjogren’s syndrome and its associated oral complications and management


1. “Sublingual Dermoid Cyst: Case Report and a Review of the Clinical, Radiological and Histological aspects of this Rare Condition” Oral Surg dol:10.1111/ors.12320 
2. “Clinician's Guide to Treatment of Common Oral Conditions 8th Edition”, Herpes Zoster, in print 
3. “Orofacial Disorders”, Chapter 5 Oral Vesiculobullous Diseases, Springer, in print 
4. “Epidemiology of Oral Cancer in Latin America” – Dental Tribune International, in print 
5. “Clinical Predictors of Oral Leukoplakia Recurrence after CO2 Laser Vaporization” - Journal of Cranio-Maxillo-Facial Surgery 43; 2015: 1875-79 
6. “Oral squamous cell carcinoma mimicking peri-implantitis” - Clinical Advances in Periodontics 28 October 2015: 1-13 
7. “Principles of General and Head & Neck Pathology for Dental Hygiene Practice”, Chapter 9 Oral Manifestations of Systemic Diseases, F.A. Davis, September 2014 
8. “ Salivary Hypofunction in Patients with Chronic Hepatitis C infection” – Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology; 110; i2: 30

Research Trials

  • Cross sectional study of dental health and needs in inpatient geriatric patients in Singapore General Hospital