Because the brackets and archwire are actually placed at the back of your teeth, they are virtually undetectable, allowing you to retain your normal appearance for the duration of your treatment. You doctor took courses specializing in the placement of these braces.
DEFINITION of 'Cost Center'. A department within an organization that does not directly add to profit, but which still costs an organization money to operate. Cost centers only contribute to a company's profitability indirectly, unlike a profit center which contributes to profitability directly through its actions.
Difference between a cost centre and a profit centre. A cost centre adds to a firm's cost whereas a profit centre adds to the firm's cost and profit. Furthermore, the main objective of a cost centre is to minimise cost whereas the main objective of a profit centre is to maximise profit.