AN ORAL CARE COMPOSITION INCLUDES AN EFFECTIVE AMOUNT OF A BASIC AMINO ACID IN FREE OR SALT FORM; AND AN EFFECTIVE AMOUNT OF CALCIUM SILICATE PARTICLES. THE CALCIUM SILICATE PARTICLES HAVE AN AVERAGE DIAMETER OF LESS THAN ABOUT 5 MICRONS, SUCH THAT THEY CAN OCCLUDE DENTINAL TUBULES OF THE TEETH. AN ORAL CARE METHOD INCLUDES APPLYING THE COMPOSITION TO AN ORAL CAVITY OF A SUBJECT TO REDUCE OR INHIBIT HYPERSENSITIVITY OF THE TEETH AND TO ACHIEVE OTHER BENEFITS.