It might be a good idea to brush your teeth on a regular basis.
I advise you to brush your teeth on a regular basis.
Have you thought about seeing a dentist.
Declining to give advice
I don't know what to advise, I'm afraid.
I wish I could suggest something, but I can't.
I wish I could help.
I'm afraid I can't really help you.
Things to remember about asking for and giving advice:
1. "Advise" is a verb.
"I advise you to learn English. You will undoubtedly need it in your higher studies"
2. "Advice" is a noun.
"My father gave me this piece of advice when I was young: never give up"
3. "Ought to" has nearly the same meaning as "should". The only difference is that "ought to " refers to a moral or external obligation but should is more of an advice.
"You ought to stop smoking."
"You should stop smoking."
4. "You'd better" is the short form of "you had better"
"You'd better see a doctor!" = "You had better see the doctor"
Study the dialogue:
I'm terrible at English and I think I should do something about it. What do you advise me to do?
I think you should try this website. It's a fantastic website for beginners.
I've heard about it, but what do you think I should start with?
You'd better start with the lessons.Then, try the exercises.