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To analyse the DIAGNOdent's performance to longitudinally monitor the arrestment of non-cavitated carious lesions in occlusal surfaces.

The sample consisted of 15 children (12–13 years old) with 40 active non-cavitated lesions. The protocol for the examinations was: prophylaxis, drying teeth for 30s; clinical examination, examination with DIAGNOdent. Lesions were classified as active or arrested according to this criteria—active lesion: opaque and whitened enamel, and arrested lesion: enamel with shiny, white or dark spot. The cut offs used for DIAGNOdent measurements were: between 0 and 14—sound tissue (stage 1), between 15 and 20—enamel lesion (stage 2) and above 20—dentine lesion (stage 3). The patients were treated with professional plaque removal, topical application of 1.23% of fluoride in gel and oral hygiene instructions. Thirty days after the first session, the lesions …