Wash any fingerprints or dust particles off the CD and dry it carefully with a cloth.
Dab a little toothpaste onto the scratch. You only need enough to cover the scratch.
Rub the toothpaste, with the cotton swab, into the scratch. Move the swab in small circles, from the center to the outside of the disc, without following the groove in the disc. This will prevent additional scratches from forming during the process.