Which of the following is a main ingredient of denture cleaning powder or tablets?

All the denture cleansing powders and tablets contain detergent, flavouring agent, alkaline compounds and sodium perborate. The main component is sodium perborate. It decomposes in water to form a peroxide solution which inturn breaks down to liberate oxygen. These oxygen bubbles are the ones that remove the debri on the denture surface. Phillip’s 12th edition page 494