Hu̍t-chhat (varnish) ê sêng-hūn ū sodium fluoride, hu̍t lông-tō· 5% (22,600 ppm), chhiūⁿ Duraphat, Cavity Shield, Duraflor. Koh-ū difluorsilane, hâm hu̍t 0.1% (1,000 ppm), chhiūⁿ Fluor Protector.