R.O.C.S. Whitening toothpaste works mainly through gentle mechanical polishing. The source ingredients linked to this effect are hydrated silica and quartz, which help remove soft plaque and external pigment from the tooth surface. When these surface deposits are reduced, enamel can reflect light more evenly, so teeth may look cleaner, smoother and brighter.
This is different from harsh bleaching action. The product is described as aiming to lift the natural white tone and shine of enamel without relying on strong bleaching. That means it is best suited to people who notice surface staining or dullness, for example from coffee, tea or everyday pigment exposure, rather than teeth that are naturally darker internally or deeply discoloured.
For best results, use it consistently as part of normal brushing rather than expecting an instant colour change. Brush carefully along the gumline and chewing surfaces, and avoid pressing too hard: polishing toothpastes are meant to work with brushing technique, not aggressive force. If staining builds up heavily or does not improve with daily oral hygiene, a dental cleaning or professional advice may be more appropriate.