Introduction Individual perception and specific requirements of aesthetic dental medicine are based on achieving the maximum effect by applying minimally invasive therapeutic procedures. Achieving harmony in the proportions and aesthetics of all parts of the face is imperative for a modern approach to restorative procedures. Aesthetic imperfections due to demineralization or developmental irregularities can be effectively treated by infiltration with a low-viscosity resin. Fluctuations in the pH value in the dental biofilm cause mineral loss and an increase in the number of pores in the surface zone of the initial caries lesion. Permanent closure of microporosity within demineralized enamel and a successful aesthetic effect can be achieved by applying the infiltration Icon technique. Procedures A clinical examination of the patient (11) revealed non-carious diffuse white lesions on the vestibular surfaces of the upper incisors. In accordance with the clinical guidelines and the manufacturer's instructions, a protocol was implemented to stop the progression of the lesions. Before applying Icon infiltration resin (DMG, Chemisch-Pharmazeutische Fabrik Gmbh, Hamburg, Germany), prophylactic tooth cleaning and isolation by placing a protective rubber dam was performed. After etching with 15% hydrochloric acid (Icon-Etch) for 2 minutes and rinsing with water for 30 seconds and drying, the vestibular surfaces of the teeth were dehydrated with 95% ethanol (Icon-Dry) 30 seconds. Finally, low-viscosity resin TEGDMA (Icon-Infiltrant) was applied for 3 minutes, which was then polymerized for 40 seconds. Outcomes At the end of the infiltration, the enamel defect is completely optically masked. In one visit, the patient received the desired solution to her aesthetic deficiency using a completely painless and non-invasive procedure. Conclusion Modern dental medicine replaces traditional conservative procedures by using low-viscosity infiltration resin and is a long-term solution for the purpose of mechanical stability of a closed lesion.