A denture treating apparatus employs a receptacle base with a chamber closed by a rotatable cover. A denture and an effervescing denture treating composition, such as a denture cleaning tablet is place in water in the chamber. When the chamber is closed, the pressure created by the effervescing tablet causes the active ingredients to penetrate small spaces in the denture. A seal is compressed between relative thick peripheral lips on the cover and receptacle base. Thinner sections of the receptacle base can bow under pressure to show that pressure is building up. A shiftable handle on the cover makes it easier for a user to close the cover and compress the seal.
