Furthermore, the doublesealof the fuse is formed in common by the 'o' shapedsealing ringandan adhesiveslayerfilledbetween the metalcapand the fusetube.
As the bacteria responsible for the tooth decay are sealed in, and deprived of nutrients, the act ofsealing the decaying tooth with the metalcap should prevent the decay from spreading, at least until the baby tooth is shed at around 10 years of age.