* Hard, crunchy foods: These foods can damage the palatal expander or dislodge it from your teeth.
* Sticky foods: These foods can stick to the palatal expander and make it difficult to clean.
* Chewy foods: These foods can put too much pressure on the palatal expander and damage it.
* Hot foods: These foods can cause the palatal expander to expand too quickly, which can be painful.
* Cold foods: These foods can cause the palatal expander to contract too quickly, which can also be painful.