The bacteria collection device is a 4mm x 2mm x 2mm square of sterilized tooth obtained from slicing an extracted healthy tooth donated by another patient. The donated teeth are either extracted impacted third molars (wisdom teeth) or teeth extracted for teeth straightening (orthodontics). The device is heat-sterilized before being bonded to the participant's tooth. The dental cement used for bonding can be removed after 48 hours with no damage to the surface of the participant's tooth.