A decayed tooth is not necessarily dead, but it may be in a state of decay. This means that the tooth has sustained damage and may be in the process of breaking down from bacterial infection. Depending on the severity of the decay, the tooth might be in the process of dying, but it is not necessarily dead yet.
The signs of decay may include discoloration, sensitivity, or even cavities. In some cases, the tooth may have become infected and an abscess may be present. If left untreated, the decay can progress and the tooth may eventually die.
Decay can be treated and reversed if caught early enough, which is why it is important to visit the dentist regularly. If the decay has progressed too far, the tooth may need to be extracted or a root canal may be needed to save the tooth.
In conclusion, a decayed tooth is not necessarily dead, but it may be in the process of dying if it is severely decayed. It is important to visit the dentist regularly in order to prevent or catch decay early, and to take care of your teeth in order to maintain their health.