 The application of glass ionomer sealants to occlusal surfaces of the posterior teeth, reduce dental caries in comparison to not using sealants at all.There is evidence that when using sealants, only 6% of people develop tooth decay over a 2-year period, in comparison to 40% of people when not using a sealant.However, it is recommended that the use of fluoride varnish alongside glass ionomer sealants should be applied in practice to further reduce the risk of secondary dental caries.