Probiotics are preparations that contain live, health-promoting bacteria, usually lactic acid bacteria or bifidobacteria. These are usually used in the form of a âcureâ over several weeks and are colonised in the oral and intestinal flora. During this time, the probiotic bacteria produce signalling substances, release them into their environment and thereby influence the composition and metabolism of the other bacteria in the oral and intestinal flora. Pathogens are inhibited and the healthy oral flora is stabilised. Probiotic preparations in the form of dry powders (e.g. OraLactin sachets) or OraLactin chewable pastilles are available for the mouth and throat area. Prebiotics, on the other hand, are natural nutrients that support the growth of healthy bacteria. For example, fibre extracts from arcacia trees or the amino acid arginine. Postbiotics are killed bacterial fragments or originally bacterial metabolic products which, like probiotic messengers, act as signalling substances and promote healthy oral flora. Pre- and postbiotics can also be used in liquid preparations such as toothpastes and mouthwashes for normal daily use.