There are two main components of braces: brackets, which are bonded directly to the tooth and arch wires that connect the brackets. Contrary to what most people think; it is the arch wire that actually moves the teeth. The brackets serve only as “handles.” The arch wire generates a steady gentle pressure to move the teeth into their proper position.
Like moving a stick through sand, as the tooth moves, the bone gives way on one side and fills in on the other. Elastics are used to make the upper and lower teeth bite together properly.