Здравствуйте! Проверьте, пожалуйста, правильно ли я использовла модальные глаголы в этих предложениях.
How to prevent tooth decay
I would recommend you to follow some simple rules to prevent decay. First of all, you should be on a diet. If you used to have snacks, you mustn’t do it as much as possible, especially sticky foods that cling to the teeth. Secondly, you must brush and floss your teeth daily. You also should use a fluoride toothpaste, because it makes your enamel more resistant to decay. And you also should visit a dentist regularly from early childhood to old age.
Спасибо.