Final answer:
Rubber cup polishing and air-powder polishing are techniques used for removing plaque and stains in dental hygiene.
Explanation:
Rubber cup polishing and air-powder polishing are methods of removing plaque and stains. These techniques are commonly used in dental offices to improve oral hygiene. Rubber cup polishing involves using a rubber cup with abrasive paste to polish teeth, whereas air-powder polishing utilizes a combination of air, water, and a fine powder to remove plaque and stains.
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