Why clean dentures with Polident Overnight Whitening Antibacterial Denture Cleanser instead of toothpaste? Dentures are a lot softer than teeth. Toothpaste contains abrasives that can scratch dentures. Bacteria can grow in scratches, which can cause bad breath. The improved Polident MicroClean formula kills 99.9% of odor-causing bacteria and other microorganisms. Denture hygiene is an important part of good oral health. Use Polident instead of toothpaste every day for a clean denture.