•Brush and floss thoroughly at least once a day.
•Reduce the sugar ingestion frequency to a few events per day, best limited to main meals.
•Use fluoride in toothpaste, table salt, mouth rinse, or water.
•See your dental hygienist 2-4 times per year.
If you do not have excellent manual dexterity, use a good electric toothbrush (unfortunately expensive).
For more info see Healthy Teeth for your Whole Life