I still feel that a fluid that can fill the scratches and cause them to basically disappear is much better. If the CD is damaged the goal should really be to r

I still feel that a fluid that can fill the scratches and cause them to basically disappear is much better. If the CD is damaged the goal should really be to read the data once, then throw it away. So I think it is fine that the filling/oil/grease is one time only because I don't need it to work more than once. With toothpaste there are risks. There is the risk that the scratches are deeper. Not only you will not be able to polish it out, you can get toothpaste particles in there permanently. In any case, applying oil is just so much easier -- you only need to wipe the CD with it and then wipe the excess thoroughly.