DOCTORS told me my white tongue was just poor oral hygiene, but they were completely wrong about what was really happening inside my body. For eight months, I dealt with a thick white coating that returned within hours of scraping it off. My breath was terrible despite brushing three times a day. Mouthwash, tongue scrapers, expensive toothpastes - nothing worked for more than a few hours. "You need to brush longer and more thoroughly," my dentist said during my fourth visit this year. "Some peop