An anterior crossbite involves one or more front teeth. The upper teeth are supposed to fit over (or in front of) the lower teeth. When this is reversed, there can be problems. It is usually best to correct these crossbites as soon as reasonably possible. Crossbites can be corrected with "braces" or sometimes a simple fixed or removable appliance. I like to use a fixed palatal arch with a finger spring to "push" the tooth forward from behind. Works very well. More here on Posterior Crossbites.
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