Greetings
Your concern is the gap between the two teeth, it may be because of a lot of reasons
1. Go to a dentist and get it examined
2. Generally the options are
Composite build up
Veneers
Crowns
Orthodontic treatment ( braces or aligners )
3. Go for the treatment which you are comfortable with.
Next Steps
Go to a dental clinic and get yourself assessed for the gap present
Health Tips
Follow proper oral hygiene measure