One week, before the Restorative procedure (1st appointment): Inform the patient (Written/Verbal); Patient signature of informed consent; Fulfilment of the project clinical file (patient identification, general clinical summary, oral clinic examination, oral hygiene state); Dental prophylaxis with fluoride toothpaste and water with a nylon brush. Vitality tests (cold and hot) executed with spray Endo cool (ethyl chloride) and warm instrument; Pre-operative sensitivity evaluation by applying air for 10 seconds from a dental syringe placed 2 cm from the tooth surface (4); NCCLs cavities will be evaluated according to the degree (1, 2, 3, 4) of sclerotic dentin (5), cavity dimensions (H-height, W-width, and D-depth) in millimetres (mm) and geometry (evaluated by profile photograph, as Angles Acute (A), Severe (S), Obtuse (O) (4); 1st Appointment-Intervention: Initial intra-oral/cavity surface and tooth digital photography; Teeth anaesthesia with 3% mepivacaine (Scandinibsa, Sintra Business Park, Portugal); Operatory field isolation with cotton rolls and retraction floss (Ultradent). All cavities cleaned with pumice and water in a rubber cup, followed by rinsing and drying. Selection composite colour by shade guide; Adhesive interventions according to G1 to G6 arms assignment. Adhesive systems will be used as SingleDose mode. Composite restorations (AdmiraFusion Universal nano-hybrid composite) with incremental filling technique (two increments maximum), light-cured (LED Unit) with an intensity of 1000mW/cm2, during 40 seconds. Restorations will be finished immediately with diamond disks (OptiDisc® medium 40μm; Kerr) and burns. Polishing performed with diamond-impregnated silicone polishers (Dimanto, Voco, CuxHaven) during 10 seconds. Intra-oral digital photography of the restoration.