also be included as well as synthetic polymers such as polyacrylates and carboxyvinyl polymers such as carbopol u00ae flavours such as peppermint and spearmint oils may also be included as well as preservatives ph adjusting agents sweetening agents and so on anti bacterial agents may also be included such as triclosan chlorhexidine copper further examples of anti bacterial agents are quaternary ammonium compounds such as cetylpyridinium chloride bis guanides such as chlorhexidine digluconate hexetidine octenidine alexidine halogenated bisphenolic compounds such as 2 2 u2032 methylenebis 4 chloro 6 bromophenol polymeric compounds which can enhance the delivery of anti bacterial agents can also be included anti caries agents such as sodium and stannous fluoride aminefluorides monosodiumfluorophosphate casein plaque buffers such as urea calcium lactate calcium glycerophosphate and strontium polyacrylates may also be included other optional ingredients include vitamins such as vitamin c desensitising agents such as potassium citrate potassium chloride potasium tartrate potassium bicarbonate potassium oxalate potassium nitrate as well as strontium salts may also be included buffers and salts to buffer the ph and ionic strength of the compositions may also be included the ph of the compositions usually ranges from 5 10 preferably 6 9 and especially preferably 7 8 5 furthermore the oral compositions may comprise anti calculus agents such as alkalimetal pyrophosphates hypophosphite containing polymers organic phosphonates phosphocitrates etc in addition the compositions may comprise functional biomolecules such as bacteriocins antibodies enzymes and so on other optional ingredients.