How long should you wear braces in order to fix a slight overbite?

It depends: I would consult with a dentist or orthodontist who could give you an estimate based on your condition.

Orthodontics: Orthodontic treatment generally lasts about 2 years, depending on the degree of the problem. What you consider a slight overbite may actually be more involved, or less. Overbite means different things to different people. Don't be fooled by promises of a quick 6-month fix. Get it done right. See a fully trained orthodontist.

Overbite: In layman's terms, an "overbite" typically refers to the upper front teeth sticking out horizontally, further than the lower front teeth. An orthodontist defines an "overbite" as the vertical overlap of the upper front teeth over the lower front teeth. It's best to have an exam with an orthodontist to determine the problem and solutions.