<prompt> In which of the following situations composites should be avoided:Fissure sealantRoot surface lesionPreventive resin restorationPosterior teeth restorations  <response>: 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. 