If a part of your tooth has been lost to decay or accidental damage then the dentist may fill it.
The white filling material sticks to your tooth and as such can be used to repair front teeth that are chipped, broken, decayed or worn.
Because they are can be matched to your tooth colour they blend in better with your natural smile and unlike silver do not run the risk of turning black in your mouth.
Coming to the hygienist is a little like going to the hairdresser. Your teeth feel so clean and fresh. with the best will in the world you never replicate the hairstyle, shine and bounciness that you come away from the hairdressers at home.