<prompt> Halitosisisprimarilybecauseof- Halitosisisprimarilybecauseof-Hydrogen sulfideAlkaline phosphatesTrypsin like enzymes Trypsin like enzymesCollagenase enzymeCollagenase enzyme  <response>: Halitosis or unpleasant smell of breath arises mainly from volatile sulfide compounds like- 1 Hydrogen sulfide H2S. 2 Methyl Mercapton CH3SH. 3 Dimethyl Sulfide . Specific character of breath odour is as follows - Rotten Eggs Volatile sulfide compounds Sweet OdourSmell of dead mice Liver insufficiency Rotten apples Unbalanced insulin dependant diabetes mellitus Fish odour Kidneys insuffiency 