My front teeth are having scratches due to which they get filled and looks dirty. Any suggestions?

There really are two options:  polish the enamel with diamond polishing paste, or place porcelain veneers.  The porcelain is very smooth, but also gives you full control of the size, shape, and color of the teeth.

It's my advice to upload your teeth photos, so I can guide you better. The best option for such teeth is porcelain veneer.

A picture would be helpful, it sounds like you may have vertical lines in your enamel that can be filled or polished. Sometimes this is just usual wear & tear, but it can also be from bruxism, or clenching / grinding your teeth.The other possibility is a rough edge from a prior filling that needs polishing.