It’s difficult to know without examining the tooth. Sometimes front teeth that have been bumped or subjected to trauma can darken in shade. It is important to have these teeth evaluated because root canal treatment may be needed to prevent further damage to the tooth. This damage is called root resorption, and If left unchecked, the tooth may be lost.
Address Dental Decay
Front teeth can also start to turn black due to decay. This is a serious situation which needs to be addressed immediately. Although the decay is extensive and has caused severe destruction of the tooth by the time the tooth starts turning black, these teeth can often still be saved if they are treated right away.