Teeth shifted after braces removed, still in warranty period, does warranty cover re-treatment?

I've had my braces removed four years ago, and they are still under a five-year 'warranty' period. The braces corrected my overbite and straightened my teeth, but gradually my overbite has returned and my bottom front teeth are now crooked, even with wearing retainers. Does the warranty only cover the... show more I've had my braces removed four years ago, and they are still under a five-year 'warranty' period. The braces corrected my overbite and straightened my teeth, but gradually my overbite has returned and my bottom front teeth are now crooked, even with wearing retainers.

Does the warranty only cover the retainer if it breaks, or could something be done about my teeth again?
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