My son has a palatal expander to help make room for his teeth and to fix a cross bite. Tonight I turned the expander as instructed and I heard a pretty loud pop. What was that pop?

What you heard was most likely the sound of the palate splitting down the middle. The split also occurs in other bones of the face as well. This is not dangerous and is the purpose of the expander. However, it is not the only way to fix a cross bite. Today, there are much gentler and less invasive means to gain space and fix cross bites. I have not used an expander in almost a decade. If an expander is part of your child's treatment plan, please call 1-800-4braces for a free second opinion.