Abstract: In one aspect, a system for detecting blood in an oral cavity during toothbrushing is disclosed. A toothbrush includes a sensor configured to emit first light at a first wavelength and second light at a second wavelength, and receive reflected portions of the light, the reflected portions having a first intensity and a second intensity, respectively. For each of a plurality of different times of a brushing session, a processor calculates a ratio of the first intensity to the second intensity. The processor identifies peaks in the ratio over the different times and, based on the number of peaks in the ratio, determines whether hemoglobin is present in the oral cavity.

Abstract: Disclosed herein is a dual component oral care composition comprising a first component comprising a solid composition comprising at least one whitening agent chosen from chloride isocyanurate and metal salts of hypochlorite; and a second component comprising an aqueous mouthwash composition comprising at least one effervescent acid. Further disclosed herein is a kit comprising the solid composition and the aqueous mouthwash composition, as well as methods of whitening teeth and/or producing antibacterial effects in the oral cavity comprising mixing the solid composition with the aqueous mouthwash composition until the solid composition disintegrates to create a mouthwash comprising hypochlorite; and contacting teeth with the mouthwash comprising hypochlorite.

Abstract: Disclosed herein is a solid composition for oral care comprising at least one whitening agent chosen from chloride isocyanurate and metal salts of hypochlorite; at least one carbonate base; and optionally at least one effervescent acid. Further disclosed herein is a kit comprising the solid composition and an aqueous liquid composition, as well as methods of whitening teeth and/or producing antibacterial effects in the oral cavity comprising mixing the solid composition with an aqueous liquid composition until the solid composition disintegrates to create a mouthwash comprising hypochlorite; and contacting teeth with the mouthwash comprising hypochlorite.