Q. When I was younger I chipped my tooth so went to my local dentist and they gave me a white filling that was fine until recently when it became discoloured. What is the procedure for fixing this problem? Will the old filling need to be removed and replaced or can this old filling be whitened? I know you will have to treat each case individually but what is the usual procedure? I am currently 16 and have had this filling for about 7 years.