64 страниц. 2014 год. LAP Lambert Academic Publishing The most common prevalent diseases which affect the oral health are dental caries and periodontal diseases. Inspite of countless number of preventing measures these disease are still a major threat to dentistry. Hence the prevention of dental caries and periodontal diseases is mandatory for obtaining good oral health. Although fluoride and other preventive efforts have led to a dramatic decline in the dental caries, the ability to control the actual infection has been limited. The concept of microbial ecological change as a mechanism of preventing dental diseases in an important era in the dentistry. Regarding elimination of pathogenic members of oral cavity a new method such as probiotics approach has been emerged into the field. The current literature aims to review probiotics and its effect on oral health while emphasizing on safety concerns.