Hello lybrate-user, Healthy teeth can be obtained by getting cleaning and polishing done by a dentist
and then maintaining it at home by brushing twice a day and using floss and mouthwash regularly. It also includes keeping the tongue clean. Gaps between the teeth can be treated by braces (Orthodontic treatment), crowns/caps, veneers
, or composite restoration. The type of treatment required completely depends on how big/small is the gap. After the cleaning and polishing if the teeth does not become white, then you need to go for teeth whitening
procedure. Kindly consult your dentist for further treatment details. Thank you.