**1. Introduction**

Bacteriophages are viruses that attack bacteria. Phages are now known to cure antibiotic-resistant bacterial infections as well as decrease bacterial virulence by overcoming the barriers bacteria used to avoid them. Bacteriophages are now being explored as potential therapeutic tools for the elimination of oral bacterial pathogens. Bacteriophages can disrupt pathogenic processes associated with biofilm and exopolysaccharide formation by oral microflora. Bacteriophages are a habitat to the human oral cavity where the oral pathogenic bacteria exist. Earlier studies show the isolation of oral bacteriophage from the oral cavity when an oral bacteriophage infecting *Lactobacillus casei* was obtained by Meyer et al. [1]. Subsequently, a range of oral bacteriophages infecting *Veillonella* species was isolated by Hiroki et al. in 1976, lytic bacteriophages for Actinomyces species were isolated by Tylenda et al. in 1985, oral bacteriophages specific for *Actinobacillus actinomycetocomitans* were described by Olsen et al. in 1993, oral bacteriophages specific for *Streptococcus mutans* were isolated by Delisle and Rotkwoski in 1993, and bacteriophages specific for *Enterococcus faecalis* were by Bachrach in 2003 [2–6]. Metagenomic analysis estimates 108 –1010 virus-like particles existing per ml of human saliva and per gram of dental plaque [7]. The isolation studies for oral phages have been challenging, where phages have been obtained from clinical (saliva, plaque, oral washings) and environmental samples. The bacteriophages for oral bacteria implicated in various oral diseases have been described in the following section. The phages

for the oral bacteria Actinomyces, Aggregatibacter, Fusobacterium, Parvimonas, Porphyromonas, Prevotella intermedia, *E. faecalis*, *S. mutans*, *Treponema denticola* are described here.
