A palatal expander is most often for children before they begin orthodontic treatment. An expander is used when the upper arch is not wide enough, therefore preventing a proper bite. By expanding the upper arch, teeth along both the upper and lower arches are better positioned to fit together. Some children do feel pressure with an expander and they may need some time to adjust to eating and drinking while wearing one. When the expander is removed, patients may have the sensation that their mouths are more spacious. And sometimes the two front top teeth may have a gap between them after wearing an expander. This will remedy itself naturally or be corrected with braces.