Calgary's often bubbly mayor has a new portrait to chew over.

The claim that gum disease is linked to heart problems or strokes doesn't hold up to serious scrutiny, the American Heart Association says.

The real estate industry, the banks and federal finance minister Jim Flaherty all say there is no housing bubble in Canada. Don Pittis, however, argues that we should gird ourselves for the fallout when the bubble pops, because the consequences would be extraordinary.