Oral hygiene preparations, an associated method, and kit for utilizing same is disclosed and wherein the oral hygiene preparations reduce the incidence of caries in patients, including immunocompromised and chemotherapy treated patients. A generator is coupled to the gas turbine engine of the aircraft. A command in the hard disk drive command queue having a minimum calculated expected access time is identified. The injection zone may have two or more interfaces and may include one or more cores to control fluids before mixing.