The story travels through Jamaica, Turkey, Bangladesh and India but ends up in a scrubby North London borough, home of the book's two unlikely heroes: prevaricating Archie Jones and intemperate Samad Iqbal. They met in the Second World War, as part of a "Buggered Battalion" and have been best friends ever since. Archie marries beautiful, buck-toothed Clara, who's on the run from her Jehovah's Witness mother, and they have a daughter, Irie. Samad marries stroppy Alsana and they have twin sons: "Children with first and last names on a direct collision course. Names that secrete within them mass exodus, cramped boats and planes, cold arrivals, medical checks."

Big questions demand boldly drawn characters. Zadie Smith's aren't heroic, just real: warm, funny, misguided and entirely familiar; reading their conversations is like eavesdropping. A simple scene, Alsana and Clara chatting about their pregnancies in the park: "A woman has to have the private things--a husband needn't be involved in body business, in a lady's ... parts."

Samad's rant about his sons--"They have both lost their way. Strayed so far from what I had intended for them. No doubt they will both marry white women called Sheila and put me in an early grave--acutely displays "the immigrant fears--dissolution, disappearance" but it also gets to the very heart of Samad.

White Teeth is a joy to read. It teems with life and exuberence and has enough cleverness and irreverent seriousness to give it bite. --Eithne Farry