can't input chinese, don't know why

You can try A Dental surgury. It's cheap and the service is good
I and my husband have followed their survice for several years.
Their address is:
APT Blk 431 #01-324, Clementi Avenue 3, Singapore 120431
Tel: 67761675
One of my labmate had the same situation as you and only costed less than 100 dollars!