Is cosmetic dentistry reliable and right for me?

My teeth are in good shape with the exception that I have a approx. 1/4 inch gap in my upper 2 front teeth. I want to have cosmetic dentistry done, but I am a little nervous about the durability over time, and the after product. Any free dental advise would be helpful.

Each person is different, and what is right for one is not right for another. Go and visit a dentist who can give you an estimate for what you may need. Often it is a free consultation. That's what I do. I give options and let the patient decide.
A simple treatment that works sometimes is to add just a little bit of bonding in between the teeth the get them to touch each other, but you have to be careful that the teeth don't look too fat afterwards. With this bonding treatment if you don't like it, you can remove it without hurting your own tooth enamel.
Good luck

My advice is worth exactly what you are paying for it, but here goes:

If the ONLY problem you see is the small gap, then veneers are probably not a good choice. Bonding, perhaps, but not veneers which would remove a small amount of healthy tooth structure.

Please explore some alternatives, such as Invisalign, before making a final decision.

If your teeth are otherwise healthy and shaped the way you like, maybe the little gap is something unique about you. Are you really sure it bothers you enough to change it? Some little "imperfections" are very attractive. Loren Hutton (a supermodel from the 60's) made a good living with a small gap in front.