1. Don't brush your teeth vigorously. It damages your tooth structure and yellowish dentin part get exposed and teeth becomes sensitive. Learn proper brushing technique from expert. 2. Bleaching depends upon clinical picture and it's indication vary from person to person. But not advocated to go for it frequently. 3. If yellowish stains or colour are intrinsic we may need to opt for Prosthetic options like composite, laminates or veneers... 4. If plaque calculus accumulated, teeth cleaning I.e. scaling helps.