I can give you some ideas, but your question has a lot in common with the question "how much is a car?" or "how much is a house?" Those costs can vary all over the map, can't they? You will see the same thing in cosmetic dentistry based on your wants and the dentist who will be treating you.
There is a process that a cosmetic dentist usually goes through to estimate the fee.
First, interview the patient. What are the problems? What does the patient want fixed? Just one tooth, eight, sixteen, twenty or twenty eight? And your answer on how many teeth you want treated might depend on how many and which teeth you show when you smile, the color, any existing fillings or unesthetic crowns, how crooked or straight your teeth are, any chips, missing teeth, etc. So the first step is you and the cosmetic dentist need to set down, discuss your goals, and probably also your budget.
Then two important question also have to be answered, what is your level of expectation of perfection and how difficult or easy will your treatment be?
A smile makeover's fees can be all over the map. It could be as little as a couple hundred dollars for bleaching. Orthodontics and Invisalign will be more. Any gum procedures like adding gums onto a tooth that has experienced much recession or taking excess gum tissue off with laser or gum surgery add costs as well. Are you needing just veneers to give you that dazzling smile, or do you need a mouth full of crowns?
And fees for crowns and veneers are all over the map as well. Some clinics and volume oriented insurance dentists "advertise" veneers for as low as $350, while I know there are some specialty cosmetic practices in New York and Los Angeles that charge up to $3,000 per tooth. Average price for veneers or cosmetic crowns by most well trained cosmetic dentists are in the range of $1,400 to $1,800 nationwide.
So in a nutshell, your job as a patient is to first decide what you don't like about your teeth and smile, and what you want to have changed. Meet with several cosmetic dentists, as I absolutely guarantee you, most cosmetic dentists will not agree on a single solution. Usually at the first meeting the cosmetic dentist can give you a good estimate on what it would cost to do your smile makeover.