Cavity between my two front teeth and caused a small gap how can it be fixed?

Composite filling: Your dentist should be able to restore these teeth with a white, bonded, composite filling. This will both get rid of the cavity and fill in the gap as well.

If there were: No space before the cavities were present, then your dentist should be able to bond the area to close the space. If there was a space (diastema) a dentist can also close that space with a bonded composite restoration. Hope this helps.

Bonding: Bonding with a white composite material can often close a space between the teeth. Was the space there before the cavity? If the space is wide sometimes bonding is not enough. Braces or in some cases veneers are a better choice. Discuss the options with your dentist.