Write down a list of hygiene rules that ensure the preservation of healthy teeth, and give a rationale for each of them.

The rules of dental hygiene:
1. Brush your teeth twice a day – in the morning and before bedtime.
2. Follow the correct brushing technique.
3. Change your toothbrush every three months.
4. Apply rinse aid.
5. To be examined by a dentist twice a year

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.