Yes, it may be done well within a month if it includes veneers or bleaching or crowns etc. For orthodontic treatment it may need 1 to 1.5 yrs. Please submit a picture, that will help to ascertain and analyse your treatment plan so that actual time duration be assessed.

Hi..it varies from months to years based on tooth condition. Regards

What cosmetic correction you are asking about?

Dear practo user,cosmetic corrections may vary from simple tooth whitening to surgical procedures like smile designing.It may vary condition to condition .some procedures take days and some months like braces treatments.so elaborate your condition to get proper suggestion.Regards

The duration of the treatment options varies according to the clinical situation to be corrected.... a proper clinical examination will be required to assess the condition and the treatment plan can be explained to you before the actual treatment is instituted..... other than orthodontic treatment, most of the aesthetic treatments can be completed within a month..... Regards.....

Cosmetic correction for teeth vary from simple tooth whitening to complex surgical procedures to achieve a desired outcome. So if you can elaborate on your problem, a better solution can be recommended. Cosmetic procedures like tooth whitening,  and narrow closing spaces between teeth may just require one sitting.wide spaces may require 2-3 sittings. If teeth are not properly aligned, it may require orthodontic correction varying from few months to 1yr. Hope this helps