I have no idea of the geography, but Dr Isabel Wu is in Causeway Bay, is excellent, was trained in Australia, & has a postgraduate specialty in pediatric dentistry. She's lovely & gentle too, & I know because she works in Macau as well.
If location is not a problem, my son has been going to to Dr Jennie Tsai in Causeway Bay (2972-2686/2893-2386) for 5 years. He actually looks forward to his dentist visits!