Not to have to EVER teeth problems like caries, bad gums caused by bad oral higine ect:
Eat 3-4 meala a day and after always brush your teeth like this.
1)Dental floss (at least twice a day, and mandatory after the last meal) first.
2)Then use mouthwash first for at least 20 sec, just 2 tea spoon will do. (the mouthwash detaches the bacterial plaque)
3) Brush your teeth with a soft toothbrush and toothpaste. (from base to top, inside and outside, then across the teeth in all directions, then your tongue. 50 sec will do).
4) Then NEVER NEVER eat or drink anything but water, in the time between the last brushing and the next meal.
5) Mouthwash the mouth and brush it with the mouthwash before going to bed.
Step 4 require discipline, hard for many, but if you contaminate again your teeth after brushing, the whole hygiene process is made useless and you will have cavities! (this is why people that say: ...but I regularly brush my teeth!!! still get cavities)
When I was 18 my dentist after having already cured 5 cavities in my mouth, told me that most of my teeth were condemned,
I came from a family that by the age of 25 lost most of their teeth and by 30 wore dentures.
The dentist then proceeded to extract one of my molars! That was the straw that broke the camel back for me.
I started then to follow STRICKLY the steps above.
I am 50 now, and I never had tooth hatches, cavities or any tooth problems. My gums are super healthy, and I spared myself years of pain and some $30.000 in dentistry, which allowed me to buy my home in cash savings.
Do a yearly ultrasound tartar cleaning or whenever you see tartar built up.