The clinical management of incisor hypomineralisation (IH) as it pertains to biophysical and aesthetic recovery, especially in the teeth of young individuals, is fraught with complexity. Treatment modalities are wide and varied, and often, if used in the wrong sequence, can lead to a suboptimal aesthetic result. Approaches, such as chemical micro-abrasion, air particle abrasion and tooth whitening have been used in the past, in addition to resin infiltration for the treatment of affected enamel. The penetration depth of hypomineralised lesions by resin infiltrant has been reported to vary and be dependent on the pre-treatment modalities used. The elimination of brown-coloured aspects of the IH lesion via tray-delivered tooth whitening is critical prior to resin infiltration because once the resin has polymerised, it will be more impermeable and thus less likely to be modified by oxidative action. This case report describes an extended resin infiltration period under diminished ambient light prior to polymerisation that was required for aesthetic success. CPD/Clinical Relevance: Ideal sequencing of treatment prior to resin infiltration is critical for physico-aesthetic success. The length of resin infiltration can be increased if results are not seen by the manufacturer-prescribed application time.