How Long Will my Teeth Take to Straighten?

While I am surprised with the 3 year estimation, most of the time an orthodontist will correct many things at once.  Unless told otherwise, they will strive for "perfect" and often get it!  Uprighting roots, perfecting a slightly off bite, etc...

You will likely be satisfied in a few short months, but your orthodontist will still see a bigger picture.  It is not WRONG, it simply a different goal.

Sometimes a dentist or orthodontist will maximize the estimated treatment time so that you are pleasantly surpised when it takes less time. If indeed your back teeth are already in good position and you're only straightening front teeth it should take less than a year. Braces are often worn up to 3 months AFTER the teeth are straight in order to stabilize the new position of the teeth and provide better long-term stability. Hope this helps...GOOD LUCK!

Just based on your pictures, I would estimate your treatment to take around 6 months if we are not addressing the bite issue.. My suggestion would be to talk to your orthodontist, there may be a miscommunication and they are probably considering correcting your bite as well.