Purpose: To determine whether fluorosed areas of teeth can be successfully treated with resin infiltration and whether the results are long lasting. Materials and Methods: For the present case of mild to moderate dental fluorosis, the microinvasive resin infiltration technique was chosen, following suboptimal results of in-office vital tooth bleaching to improve the aesthetic appearance of the affected teeth. Results: Six months after treatment, the white opaque and brown discolourations remain masked. Conclusion: This case report demonstrates that resin infiltration is an agreeable option for this type of tooth discolouration, rather than choosing more invasive, conventional procedures. More studies need to be completed to determine longer-term outcomes of the technique. Schlagwörter: dental fluorosis, long-term stability, tooth discolourations, resin infiltration