A curable dental composition comprising • a curable polyether group containing polymer as component, • an initiator capable of initiating a curing reaction of component as component, • an F-containing compound as component, wherein the F-containing compound has the following formula: (G 1 -L 1 -O) s -R f a -O-L 2 -G 2 wherein: G 1 and G 2 each independently represents a non-ionic endgroup that is free of polyoxyalkylene groups or contains polyoxyalkylene such that the total amount thereof in the F-containing compound is not more than 10% by weight based on the molecular weight of the F-containing compound; L 1 and L 2 each independently represents an aliphatic hydrocarbon group or a partially or fully fluorinated aliphatic hydrocarbon group; R f a represents a mono-valent or divalent partially or fully fluorinated aliphatic group or a partially or fully fluorinated aliphatic group interrupted by one or more oxygen atoms; with the proviso that at least one of the following conditions is fulfilled: (i) at least one of the moieties L 1 -G 1 and L 2 -G 2 is partially or fully fluorinated or (ii) R f is a partially or fully fluorinated aliphatic group interrupted by one or more oxygen atoms. • a curable polyether group containing polymer as component, • an initiator capable of initiating a curing reaction of component as component, • an F-containing compound as component, wherein the F-containing compound has the following formula: (G 1 -L 1 -O) s -R f a -O-L 2 -G 2 wherein: G 1 and G 2 each independently represents a non-ionic endgroup that is free of polyoxyalkylene groups or contains polyoxyalkylene such that the total amount thereof in the F-containing compound is not more than 10% by weight based on the molecular weight of the F-containing compound; L 1 and L 2 each independently represents an aliphatic hydrocarbon group or a partially or fully fluorinated aliphatic hydrocarbon group; R f a represents a mono-valent or divalent partially or fully fluorinated aliphatic group or a partially or fully fluorinated aliphatic group interrupted by one or more oxygen atoms; with the proviso that at least one of the following conditions is fulfilled: (i) at least one of the moieties L 1 -G 1 and L 2 -G 2 is partially or fully fluorinated or (ii) R f is a partially or fully fluorinated aliphatic group interrupted by one or more oxygen atoms. G 1 and G 2 each independently represents a non-ionic endgroup that is free of polyoxyalkylene groups or contains polyoxyalkylene such that the total amount thereof in the F-containing compound is not more than 10% by weight based on the molecular weight of the F-containing compound; L 1 and L 2 each independently represents an aliphatic hydrocarbon group or a partially or fully fluorinated aliphatic hydrocarbon group; R f a represents a mono-valent or divalent partially or fully fluorinated aliphatic group or a partially or fully fluorinated aliphatic group interrupted by one or more oxygen atoms; with the proviso that at least one of the following conditions is fulfilled: (i) at least one of the moieties L 1 -G 1 and L 2 -G 2 is partially or fully fluorinated or (ii) R f is a partially or fully fluorinated aliphatic group interrupted by one or more oxygen atoms. (i) at least one of the moieties L 1 -G 1 and L 2 -G 2 is partially or fully fluorinated or (ii) R f is a partially or fully fluorinated aliphatic group interrupted by one or more oxygen atoms.