Kindly visit your dentist
and get the required treatment as without having a look at the gap it is difficult to suggest a proper treatment. If the gap is more between your front teeth then may be you will have to get orthodontic treatment. If it's a mild gap may be it can be filled by a restoration or smile designing can be done to not only close the gap but also give you a good smile and look. So kindly visit your dentist and get the required treatment done.