Dentists make good money!
I just visited the NTU Dental Centre this afternoon to get two fillings done.. been feeling some pain recently on the back teeth.. I was amazed at the amount of decay at the back tooth area despite brushing my teeth everyday! But it's true that the toothbrush has a lot of difficulty in reaching into the little crevices on the back molars. anyway, that ten minute session with the dentist cost me $80! so people, take care of your teeth! :D