You can use himalays sparkling white toothpaste or whitospark (mankind) tooth paste.
Next Steps
jus visit the nearby dentist and ask him for the alternative teeth whitening procedures like bleaching etc.. if you dont acheive it in tooth pastes.
Health Tips
if you are using chlorhexidine mouthwash for longterm pls stop using it. coz longterm use changes ur tooth color. avoid having staining foods like tea/coffee temporarly once you get back your brighter smile u can have it. thank you