VC 23140 is used for charging someone under 21 years old who has a .05% BAC or more. Congratulations on getting the case dismissed. Assuming that is a court dismissal, you still have DMV to deal with. DMV has a different burden of proof and you need to win that hearing to avoid the minimum one year suspension. If you win DMV, you can get your license back.
You should consult with a DUI lawyer if you have not done so already. Under 21 DMV hearings are often very difficult to win.