Hi. Braces will work on grill/grillz or newer heads depending on the mouth fit. The actions that come with this head are not permanent.
Below you can check out my smile/smirk which I use to show off my braces or if you dont like those you can search for smile/smirk in the catalog from a variety of creators.
If you're having a hard time finding grill/grillz heads you can check my catalog for these type of heads or other creator catalogs.
Before you buy a grill/grillz head make sure you try it on the normal head as you may not need to have the grill/grillz depending on the teeth if it shows through the braces.