What is the right age to start an orthodontic expander?

In the past month, I saw the mother of a young girl who had an upper fixed rapid maxillary expander for her bilateral crossbite. Fortunately, the girl was 9 years old and the RME worked as predicted. Her mother had a bilateral posterior crossbite with a really narrow maxilla and I knew if she was to have correction for this, she would need a maxillary surgically assisted expansion.

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