A method and apparatus for multiplexing data streams is provided. A number of light-emitting sources have intensities that are varied in accordance with an image. The cooled process gas stream is contacted with a cooled section of the adsorbent to adsorb SAC therefrom, producing a SAC-depleted process gas stream and a SAC-laden adsorbent. The drive mechanism includes a resiliently deformable element, which exerts a resilient force to return the shaft toward the retracted or deployed position, according to the angular position of the shaft with respect to an intermediate position of the shaft between the deployed position and the retracted position. A pocket is formed in the carrier substrate, and the chip that was removed is placed into the pocket formed in the carrier substrate. Method of using such compositions for the cleaning and polishing of dental enamel, such methods including the step of applying such oral care compositions to the teeth of a user.