Why do people not take proper care of their teeth and often suffer from a variety of diseases?

People do not take proper care of their teeth for several reasons:
1. Laziness to brush your teeth 2 times a day
2. No time (for example, work late and go to bed exhausted)
3. Some people brush their teeth incorrectly (too fast or too long, make the wrong brush strokes)
4. People do not even realize that dental health also depends on their diet (eat hot and drink cold, eat too much sweets)
5. Incorrectly selected paste or brush is also a common mistake.
6. And do not forget to change the brushes every 2 months, because harmful bacteria accumulate on it.