Some teeth require extractions, or removal, because they have become broken down to a point they are unable to be restored with even a crown. This can happen due to deep decay, enamel defects, or injury. Teeth may also require extractions if the nerve is unhealthy due to infection or trauma, where root canal treatment is not recommended or possible. When an infection causes the nerve to die, teeth can develop an abscess around the roots. Baby teeth that have become abscessed are recommended to be extracted as well to remove the source of the infection and prevent the spread of the infection into the rest of the body. In some situations, baby teeth may also be recommended to be extracted for orthodontic reasons if significant crowding exists.