No. KöR Whitening Deep Bleaching trays are very different. They’re comfortable; because they’re thin and form-fitting, you’ll forget they’re even in your mouth. They’re convenient; by wearing these only while you sleep, it doesn’t interfere with your busy day. Also, unlike regular trays, the KöR Whitening Deep Bleaching Trays seal the bleach inside the tray, preventing the gel from quickly leaking into your mouth.