Can I get a retainer made to fit the "perfect " form of my teeth?

I didn't wear my retainer regularly at the beginning of then I took of my braces. One of my tooth shifted. When I wore my retainer over night it would realign, then more back. I recently lost my retainer. Can I get a retainer that is suppose to fit my perfect teeth or will the mold include the shifted tooth? Is it possible to get the mold and then fix it to the perfect mold?

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