U can close ur space by orthodontic treatment or other esthetic procedures. As u say space between ur teeth r big ,  orthodontic treatment would be ideal.

Dear Mr Shiv, we need to analyse your front teeth as well as the lower teeth, the bite and give you aesthetic solution. The space can be closed by braces/ orthodontically or by crowns. Since you mentioned that they are big in size.... closing space by filling material is a lesser option. Having pictures of your teeth would have been helpful.