Hi ...it's possible..it can be filled in the same shape of the caries till its extension.Tooth coloured laser fillings are available with increased duration and strength.Regular dental visits and proper oral hygiene maintenance will keep the restoration last longer.Cost depends on the place and the dentist you visit.
Next Steps
If u have found any black spots/caries in ur tooth even it is initial,visit dentist and avoid further dental issues.
Health Tips
Advised to do regular dental check up and teeth cleaning every 6 months