palate expanders

My 8 year old daughter had palate expanders installed about 2 months ago. The last few days, she has been complaining about pain in/around the bottom jaw. We took her to orthodontist and after examining her, we were told that the pain may be caused due to the fact that the upper and lower teeth no longer sit properly on top of each other, causing her to grind. He concluded that it is the grinding that is causing the pain. He mentioned that normally when expanding the upper jaw, the bottom jaw will make some expansion as well, but in my daughter's case, the lower jaw has made little change. He is now suggesting expanders for the bottom jaw. The possibility of having to install bottom jaw expander was not explained to us at the start of this procedure. Is his recommendation appropriate? if so, how common is it to install lower jaw expanders? Thanks, MR

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