chemical preparations for use by [ dentists and ]dental laboratories; namely, adhesion promoters,[ teeth coating material such as protective lacquers of ceramic, metal or plastic, particularly photocuring plastics for [ dental and ]dental-laboratory purposes, [and teeth masking materials such as protective lacquers of ceramic, metal or plastic, particularly photocuring plastics for dental and dental-laboratory purposes; teeth cleaning fluids especially oxidic solvents; adjuvants particularly ...