Which of the following statements is true regarding types of tooth stains?

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In general,yellow-brown discolorations are easier to bleach than blue-gray and black colors.Extrinsic stains are on the tooth surface.Some extrinsic stains located on the surface can be removed,completely or in part,by hand or ultrasonic scaling and coronal polishing.Some stains have penetrated the enamel surface and cannot be polished or scaled away.Tetracycline derivatives such as minocycline can cause discoloration of teeth in adults as well as children.

Which of the Following Statements Is True Regarding Types of Tooth