Cavities lead to tooth decay and if the tooth decay is left unattended, it leads to a situation where the damaged portions have to be removed. These are replaced with a tooth filling. But however it's the final call of a dentist to suggest if you require a dental fillings treatment. Cavity filling is a step-by-step process and has become state of the art in recent times. At the beginning of the procedure a local anesthesia is given to the numb the area. Then the decayed parts of the tooth are cut out and cleaned. The shape for the dental restoration is now arrived upon by the dentist where the cavity is filled with the agreed upon filling. The nature of the repair will determine the type of filling needed. The usual and the most commonly used one is the amalgam (silver) fillings and composite (plastic) fillings. Gold fillings are also used and these have the highest life span of all the fillings. In some extreme cases if the fracture of the tooth is high, a cap or a crown is generally topped to the filling thus making the bond strong. These treatments are painless and the post treatment care is also minimal requiring very few visits to the dentists. Sensitivity in the filled in areas is felt for the first few days and this numbs soon. If properly cared for, an average filling can last up to 5 or in even 10 years in some cases depending on the type of filling used.