The use of tooth-colored materials in restorative dentistry raised due to high esthetic demand from the patients. The main material used today is resin-based composite, but glass ionomer cements are more biocompatible to the dentin and can remineralize affected dentin. So, the sandwich technique can answer both issues- biocompatibility and esthetic results. The question raised for this research was if the resin-based composite can be bonded to the glass-ionomer cement so no micro leakage will occur between the two components. Shear Bond Strength (SBS) analyses at (TCBC) Turku Clinical Biomaterial Centre (Finland) and at Pediatric dental clinic at Barzilai Medical Center (Israel) showed that the bonding between resin-based composite and glass-ionomer cement after etching and bonding of glass-ionomer cement happens and increases with time. The conclusion was that the sandwich technique is an optional treatment for deep carious lesions at sites with high esthetic demands.