Resin infiltration (RI) is a technique that arrests non-cavitated carious lesions.61,62 It can treat non-cavitated lesions on smooth and approximal surfaces in both dentitions effectively. Lesions have to be limited to enamel and the outer third of dentine.61,62,63,64,65 It can also camouflage the whitish appearance of hypomineralised enamel on smooth surfaces.62,64 Similar to sealants, this is also known as a micro-invasive treatment.