Epic in scale and intimate in approach, White Teeth is a formidably ambitious debut. First novelist Zadie Smith takes on race, sex, class, history, and the minefield of gender politics, and such is her wit and inventiveness that these weighty subjects seem effortlessly light. She also has an impressive geographical range, guiding the reader from Jamaica to Turkey to Bangladesh and back again. Still, the book's home base is a scrubby North London borough, where we encounter Smith's unlikely heroes: prevaricating Archie Jones and intemperate Samad Iqbal, who served together in the so-called Buggered Battalion during World War II. In the ensuing decades, both have gone forth and multiplied: Archie marries beautiful, bucktoothed Clara--who's on the run from her Jehovah's Witness mother--and fathers a daughter. Samad marries stroppy Alsana, who gives birth to twin sons. Here is multiculturalism in its most elemental form: "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. Even a simple exchange between Alsana and Clara about their pregnancies has a comical ring of truth: "A woman has to have the private things--a husband needn't be involved in body business, in a lady's