Ninety patients aged 3-17 years who were treated under general anaesthesia were randomly assigned into three groups as follows : group 1 : Fluor Protector ( 0.1 % fluoride varnish ) ; group 2 : Cervitec Plus ( 1 % chlorhexidine - 1 % thymol varnish ) + Cervitec Gel ( 0.2 % chlorhexidine-0 .2 % sodium fluoride ) ; group 3 : control ( toothbrushing only ) .