A very common reason involves a tooth that is too badly damaged, from trauma or decay, to be repaired.Other reasons include:
- A crowded mouth.
- Infection or Risk of infection.
- Periodontal disease
- Damaged or man-made heart valves
- Congenital heart defect
- Impaired immune system
- Liver disease (cirrhosis)
- Artificial joint, such as a hip replacement
- History of bacterial endocarditis