LeAnn Rimes is suing her dentist, claiming he botched up her mouth so bad ... it's messing up her career.
In the lawsuit ... obtained by TMZ ... Rimes claims she went to Dr. Duane C. McKay for various dental work over 3 years. Some of the work included upper front veneers and crowns that the dentist promised would address her TMJ-related pain as well as improve her appearance.
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