In another sense - No . The belt is held in tension by a spring loaded wheel. As the belt stretches the spring is designed to press the wheel against the belt to remove slack. Cleaning it, readjusting it, may help. It may be worn out, or just the belt may need replacing.
Question
How many miles on the belt?
Ford says replace belt at 100 t0 125 k miles.


2012 Lotus Evora --------- 95 Mystique MTX - GONE 395,000 Kms --------- Both Zetecs '97 Contour Mtx - stock - GONE