orthodontist

牙齒矯正醫生 = orthodontist

you can see below this list......

"牙齒矯正科專科醫生" 專科名銜的牙醫
http://www.dchk.org.hk/list/list1.htm

I worked with Dr. Ta 謝斯恩 before......he is nice and his technique is very good.
Recommend him to you and you can think of it......

Anyway, the dentist with orthodontist cert is more quality than the one who haven't...

Hope it's help