The document discusses oral hygiene and common dental problems. It notes that 90% of dental patients complain of pain from issues like dental caries, pulpitis, tooth mobility, and dental abscesses. Another 10% have problems like tooth discoloration, halitosis, sensitivity, and plaque/calculus buildup. It defines dental plaque and calculus as sticky films that contain bacteria and hardened plaque. The document provides tips for maintaining good oral hygiene, including brushing twice daily, flossing, eating a balanced diet, using fluoride toothpaste, avoiding tobacco, and visiting the dentist regularly. It stresses that most dental issues can be prevented through proper hygiene practices.