Specialist orthodontists have to undergo additional postgraduate training beyond dental school to learn the proper way to diagnose, prevent and treat improper bites. Only those who have taken this training may call themselves "Specialist orthodontists" and are more experienced and qualified than general dentists to provide orthodontic treatments. Some of our orthodontists have undertaken a further two years of extra training after becoming specialist orthodontists to become consultant orthodontists and hold consultant posts in various hospitals. Consultant orthodontists undertake this extra training to manage difficult orthodontic cases and complex facial and dental irregularity problems.