Lingual braces are bonded to the inner surface of the teeth (on the tongue side). Fitting them is difficult because visibility on the inside is reduced, and adjusting them is also harder for the orthodontist. These factors can have a negative effect on the final result. Of course, orthodontists who are experienced with lingual braces can also promise excellent results. There are different types of lingual braces – conventional, self-ligating, 2D, 3D, custom-made and off-the-shelf. As you already know, the best braces are the ones your orthodontist knows best.
This answer is for general information. Your own case needs an examination by an orthodontist.