If you are not experiencing any pain and discomfort then the first line of treatment is composite (tooth colored filling). But it is better to get an Xray done prior to the treatment.
The price range varies as per the city and as per the qualification of dentist. For the front permanent teeth the composite filling ranges from $91 to $118.........For more info visit the link.... http://www.identalhub.com/article_average-cost-of-dental-filling-449.aspx