In one embodiment, the composition is a curable dental composition comprising a polyacid (e.g., a polymer having a plurality of acidic repeating groups); an acid-reactive filler; at least 10 percent by weight nanofiller or a combination of nanofillers each having an average particle size no more than 200 nanometers; water; and optionally a polymerizable component (e.g., an ethylenically unsaturate