I'm 27, have very crooked teeth and overbite. Is Invisalign right for me and how long does it take for alignment? (photos)

Invisalign can be used for almost any orthodontic condition.  I am providing  a link to a very crowded case I treated so that you may see the possibilities. This case took 14 months to treat and you could have your condition treated with invisalign is approximately the same time frame.Be sure to have a consultations with a sufficient number of dentists or orthodontists until you find one you are sure can treat your case successfully.  Invisalign results will vary depending on the experience and Invisalign training of the dentist or orthodontist who treats the case.  

yes, invisalign will work in your case. it will take around 1 to 1.5 year. approx cost in USA is $3000 - 4500.

Clear aligners have come a long way.  While the easiest and most successful cases are those with smaller movements, larger movements and more complicated cases are becoming increasingly achievable.  While traditional braces will get you where you want to be quicker, I think that you could definitely get good results using Invisalign or Clear Correct.  It's tough to know exactly without a more thorough examination (radiographs etc.), but I would estimate a two year timeframe.  Prices range depending on your geographical location and complexity of the case.  I'd say 5,000-6,000 but that's an approximation.  Your best bet is to have a consultation with an Invisalign or Clear Correct provider and you can get more tailored information from there.  :)