There are disadvantages to using too many "synonyms" in your article. For example, will the reader understand when you use "misaligned teeth" or "asymmetrical teeth", etc. that you really only mean "crooked teeth", but are using different words only for variation? Or will they wonder what all these distinctions you are making mean?
Another way to avoid repetition is to use phrases such "teeth like this", "such teeth", "this type of dentition", etc. in places where it's obvious that these phrases refer to "crooked teeth".
PS: I don't know of any common slang terms for crooked teeth.



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