Lifetime Tooth Loss: Average Number and Causes

On average, adults lose about 12 permanent teeth over their lifetime. While individual experiences vary—some people lose more, others fewer—the statistical mean hovers around 12 teeth.

Wisdom teeth (third molars) are the most frequently lost teeth, often due to impaction, crowding, or preventive extraction. Other teeth may be lost to dental caries (decay), traumatic injury, periodontal disease, or severe infection requiring extraction.