In which of the following situations composites should be avoided:
Composites are usually contraindicated in root surface lesions as gap formation is seen as a result of the forces of polymerization shrinkage being higher than initial bond strength.  
Composites are effectively used for pit and fissure sealants, preventive resin restorations and core build ups.
Fissure sealant
Root surface lesion
Preventive resin restoration
Posterior teeth restorations