A precancerous condition is a general state associated with a significantly increased risk of developing cancer. Lesions having malignant potential that are both histological and clinical have recently been referred to by the broad name "potentially premalignant oral epithelial lesions" (PPOELs). This book covers the chapters on aetiology, types of precancerous condition, diagnosis, its prevention and management aspects. I feel this concise book helps to dental faculty, dental students and practitioner to upgrade their knowledge about precancerous lesion in diagnosis and management.