Actually, dentistry involves various professions at the same time. A dentist should be a good planner (engineer) and a good artist beside being a doctor to be successful.
We may explain esthetic dentistry as total of procedures consisting beautification of teeth like an artist who makes his/her own picture more beautiful with brush strokes and planning and operating intra oral structures milimetrically like an engineer who plans the smallest details of a structure.
Teeth should have harmony both between themselves and with face esthetic to have a beautiful smile. A good smile is important for esthetic and self confidence of an individual. Having a beautiful smile makes people happy.