The principal reason why teeth fall out (or have to be extracted by a dentist) is basically a failure to take proper care of teeth and gums.
Brushing and flossing daily (and properly) will prevent dental issues such as gum disease and tooth decay. Both of these can result in tooth loss -- but there are other factors which can determine how healthy our teeth and gums are including:
- A poor diet with too much sugar, leading to tooth decay
- Use of tobacco and tobacco products
- Excessive use of alcohol
Another common cause of tooth loss is injuries to the teeth -- which can best be avoided by using a protective mouthguard while participating in sporting activities.