Yeah I mean you can bleach it for a total whitening but it has side effects like your enamel could vanish and the sad truth is our inner part of the teeth is yellow, so it's not recommended. But still if you really want it to be white you can cover it by a composite, it's not that costy but it doesn't last forever. It could get back to what it is now like after a year probably. So you need to do the composite every time it goes off. Good luck