What is the best way to whiten teeth besides brushing after everymeal? I brush my teeth to a day but before I didn't so I have yellow teeth? What should I do?Get Whitestrips?Or spring for a precedure? Help please.

What is the best way to whiten teeth besides brushing after everymeal??I brush my teeth 2 a day but b4 I didn't so I have yellow teeth??What should I do?Get Whitestrips?Or spring for a precedure??Help please.
How old are you. I'm asking so I know what to say.