Concern! Teeth whitening.. Habit?

What are some good habits for teeth whitening?

Maybe because I often drink carbonated drinks or coffee... my teeth aren't very whiteㅠㅠ

I do not drink alcohol or smoke cigarettes!

Are there any habits or products that help with teeth whitening?

How much would it cost if I go to the dentist??

And, is it okay to continue receiving teeth whitening treatments regularly? I'm worried it might cause excessive wear or something...