Correct!
Tartar is mineralized plaque.

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Plaque is a colony of bacteria, mixed with saliva, blood cell, and other bacterial components. Plaque often leads to tooth and gum disease.

Dental tartar, or calculus, occurs when plaque becomes mineralized (hard) and firmly adheres to the tooth enamel then erodes the gingival tissue.

Veterinary Q & A: Dental Care For Pets

More dental questions?
Here is an excellent FAQ (Frequently Asked Questions) about pet's teeth, from Dr. Holmstrom at the Pets Need Dental Care, too site

Related Reading
The Importance of Dental Care for Pets
Pets Need Dental Care, Too - Main pet dental Health Month web site
Paws for Pets - Dental Care - From the AVMA
More - Sources of your pet's oral pain - From Ben H. Colmery III, DVM Veterinary Dental Specialist
All Pet's Dental - Excellent pet dental resource
Dental Care For Pets - Overview and photos

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