As society ages, maintaining oral hygiene so that food can be chewed well and enjoyed is very important in terms of quality of life (QOL). Recently, oral care for the elderly has become a topic of increasing interest, yet many dependent elderly have difficulty brushing their own teeth. Moreover, since it is not easy for family members or caregivers to clean another person's teeth, the teeth of dependent elderly who cannot brush themselves are often simply left unclean. Recently, we are coming to a better understanding of how foreign bodies and bacteria in the mouth are related to.
