It’s the social faux pas that dare not speak its name. Principally, because it doesn’t actually exist. Have you heard of ‘winter breath’? I mean, we all know what ‘summer breath’ smells like — rosé and fags — but as yet, nobody has turned these piquant expellations into a problem. Enter, stage left, ‘breath guru’ Dr Harold Katz, who claims that halitosis becomes more prevalent during the winter months because your mouth is drier due to factors such as excess heating, over-consumption of alcohol and feasting on foods that cause bacteria, such as cheese. Before you start violently sucking on a Smint, remember this: the whole of London is over-indulging at this time of year, ergo our breath all smells the same — a festive mix of red wine, gingerbread latte and Strepsils. Don’t judge mine, and I won’t judge yours.