The American Dental Association (ADA) Mouth Healthy site suggests teeth are usually removed due to trauma, disease or crowding. When a tooth cannot be repaired with a filling or a crown because of an accident or extensive decay, an extraction may be your best recourse. Teeth that aren't supported by enough bone due to periodontal disease are also candidates for removal. Infected (abscessed) teeth that don't respond to root canal treatment may need to be taken out, as well.