LeAnn Rimes sues dentist.

Rimes sues dentist - The Brandi Glanville feud so often played out on Twitter took a break for a LeAnn Rimes unhappy smile this week and a real lawsuit.

The country singer and Twitter addict's mouth is sore and she blames her dentist and is suing him.

Rimes claims his work on her teeth is ruining her career.

The country singer has filed a lawsuit - obtained by TMZ - against Dr. Duane C. McKay on several occasions over the last three years to get work which has included upper front veneers and crowns which she was told would ease her TMJ-related pain and improve the appearance of her teeth.

However, Rimes states in the legal papers the dental procedures have actually left her in terrible pain and her mouth often bleeds because of the work.

The 30-year-old blonde also claims she has had to undergo nine painful root canal surgeries and have and bone grafting as well as have a temporary bridge fitted and undergo a course of physical therapy.

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In the lawsuit, Rimes claims she will have a ''permanent cosmetic deficiency'' as a result of Dr. McKay's work and the pain she has endured has stopped her from singing and performing live.

The 'Crazy Women' singer is seeking unspecified damages for physical, emotional and psychiatric injuries and is seeking cash for loss of past and future earnings.

Rimes - who is married to Eddie Cibrian - has often took to her Twitter account to complain about her teeth troubles.

Last February, she tweeted: ''K, coming clean ... I had minor surgery this week and I've been in SO much pain it's not even funny.

''Nothing major just annoying! Pain pain go away!!!!!! When it's mouth pain and jaw pain it makes your whole head pound! YUCK. (sic)''

© Bang Showbiz