Hello.
There are various treatment modalities (braces-fixed, removable orthodontic appliance, veneers, crowns, restorations) for your concerned problem.
But it all depends on the severity of the disease as well as etiology (cause) of the disease.
In case you opt for fixed braces, it can take anywhere between 6 months to 2 years depending on your profile.
Braces will improve your facial profile, but there will be no change in jaw line. But, the changes will definitely make you smile more.
Next Steps
Visit a dentist