The caries infiltration technique constitutes an additional new treatment concept. Here, the surface alone is not exclusively coated but a diffusion barrier is instead created inside the cavity itself, through the penetration of the "infiltrant" into the carious lesion (Paris et al. 2010, Meyer-Lueckel et al. 2010, 2009, 2008, Phark et al. 2009). In current studies, it has been possible to demonstrate inhibition of the progression of carious lesions with the infiltration technique, both in bovine teeth in situ and in artificially generated carious lesions in human teeth in vitro (Paris et al. 2010).