You have mentioned a different heading and the description of a problems is totally different from that. If the problem is with the wisdom teeth they need to be evaluated for their present condition so that the right treatment can be suggested which most likely would be in the form of extraction of the offending tooth if it is impacted. If there is spacing between the teeth it is not going to close itself on its own so you will be requiring braces, if you are not happy with your smile because it is an aesthetic treatment which depends upon the patient's aesthetic requirements. And coming to the cost, it is not a costly treatment if you compare it with the drastic change in your entire smile and personality which it is going to bring. Regards.