Typically, when a crossbite involves the premolars and molars like yours does, I would recommend speaking with an orthodontist first. Ask how confident they are that orthodontics can correct the crossbite, whether they would recommend traditional braces or Invisalign, and approximately how long they expect treatment to take. That said, it is sometimes possible to improve a crossbite significantly with porcelain veneers and/or crowns, depending on how severe the bite discrepancy is. In a case like this, you would often need to treat both the upper and lower teeth because the goal is to change the apparent angulation of the teeth from both directions. For example, the upper teeth may need to be built slightly farther outward, while the lower teeth may need to be brought slightly inward with the restorations. On some of the back teeth, crowns may be more appropriate than veneers because a larger change in tooth position or angulation can require more reduction of the natural tooth. Veneers work best when the amount of directional change needed is more conservative. The important thing to understand is that veneers and crowns do not actually move the roots of the teeth the way orthodontics does. They can sometimes camouflage or compensate for the crossbite by changing the shape and direction of the visible portion of the teeth. Whether that is a reasonable option in your case depends heavily on your bite, the amount of correction needed, and how much natural tooth structure would have to be removed. If orthodontics can predictably correct the crossbite without restorative treatment, that is generally the more conservative option. If you are trying to avoid braces or Invisalign, then a cosmetic dentist experienced in complex bite changes could evaluate whether veneers, crowns, or a combination of the two could realistically improve it.