Which Statement Is Not True Concerning Ultrasonic Scalers

Which statement is not true concerning ultrasonic scalers?

A) The spray of water at the tip of the ultrasonic scaler prevents the tip from getting too hot and continuously flushes debris and bacteria from the pocket.
B) The ultrasonic scaler is used to remove only supragingival calculus and difficult stain.
C) The ultrasonic scaler may damage porcelain crowns, composite resins, and laminate veneers.
D) The ultrasonic scaler should not be used on primary teeth or newly erupted permanent teeth.