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.
direct cost. An expense that can be traced directly to (or identified with) a specific cost center or cost object such as a department, process, or product.