| http://www.w3.org/ns/prov#value | - Preferred polishing agents include dicalcium phosphate and siliceous materials, such as silica and more preferably a precipitated amorphous hydrated silica, such as Zeodent 115, marketed by J. M. Huber Chemicals Division, Havre de Grace, Md. 21078, or Sylodent 783 Sylodent XWA 300 available from Grace Davison, Baltimore, Md. 21203.
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