Ninety patients aged @-@ years who were treated under general anaesthesia were randomly assigned into three groups as follows : group @ : Fluor Protector ( @ % fluoride varnish ) ; group @ : Cervitec Plus ( @ % chlorhexidine - @ % thymol varnish ) + Cervitec Gel ( @ % chlorhexidine-@ @ % sodium fluoride ) ; group @ : control ( toothbrushing only ) .