Although often linked to perio, bad breath can turn sweet when tongue is 'deplaqued'.
O'hehir
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D003742:Dental Devices, Home Care; D003773:Dental Plaque / Q000150:complications / Q000628:therapy; D006209:Halitosis / Q000209:etiology* / Q000517:prevention & control; D006801:Humans; D009910:Oral Hygiene / Q000379:methods; D010510:Periodontal Diseases; D013457:Sulfur Compounds; D014059:Tongue / Q000382:microbiology*; D014060:Tongue Diseases / Q000150:complications / Q000382:microbiology
D013457:Sulfur Compounds