Dental decay (cavities) is drilled to remove the infected tooth structure.
The preparations are then filled with a white tooth coloured composite filling material.
Composite filling material is usually a particulate ceramic in a plastic or acrylic matrix that is bonded and light cured into a hard filling.
It is common to have some sensitivity with white fillings. This usually resolves in a few days and on occasion a few weeks.
In some circumstances, a silver amalgam filling may be recommended and placed but not without first obtaining your consent.