Where is a cheaper dental clinic in Singapore for fillings?

I've had fillings here:BLK410

Eunos

Road

#01-138

Doctors at Lian Li Dental Clinic are experienced, fast and cheap. See them as you go. You can also schedule an appointment. It's in the middle of Paya Lebar MRT and Younos MRT, off the main road. Fillings are $40 a piece. The doctor was very skillful and she told me to get up before I could lie down enough. finished within 5 minutes.