An overbite Shodokan is when your mouth is closed and there is a significant gap between your bottom front teeth and the top front teeth. It makes them look horselike.
I had an overbite and it was fixed in 2 years with a retainer. I couldn't use braces because they also had to spread the roof of my mouth because it was to narrow. It worked very well and was worth it, eventually.
PS. I don't think most people would be looking at your examples teeth.