There are many things to consider when considering which of the two can or should be done to correct really crooked teeth, braces or porcelain veneers?Your first question, is it possible to just do veneers? The answer for most adults is yes. But you also asked what is best, and most dentists and orthodontists would argue that orthodontics would be the best alternative. But, be aware that orthodontics is not without its downside. Many times for adults treatment can vary between 9 to 30 months. And, almost always a long term use of retainers will be necessary to prevent relapse, or the teeth going back to their original crooked position. Many orthodontists will tell the adult patients that they will need to wear a night time retainer for the rest of their life if they want to keep them straight. And, there was one study that said that 100% of all adult orthodontic patients eventually get relapse to some degree.In my cosmetic dental practice I have treated many adult patients who not only had crooked teeth, but also didn't like the color, size or shape of their teeth. Also they didn't want months to years of treatment. Porcelain veneering enabled us to treat these patients in several weeks, and because we didn't actually move their teeth, they didn't need to wear retainers. I don't think there is only one best way to treat my patients, either braces or veneers, as I do refer many patients to orthodontists. However, I feel many times porcelain veneers is the best option for my patients and I like to inform them of all the pros and cons, and let them make informed decisions on how they would like to be treated. After all, it is their mouth and smile!If you would like to see a number of examples of how cosmetic dentistry corrected patients with crooked teeth without braces, go to the link below, and go through and read about the patients and their treatment. I think you'll be enlightened about the benefits of cosmetic dentistry!