Is tooth and tongue staining caused by Corsodyl Original Mouthwash (chlorhexidine digluconate) permanent?

Tooth and tongue staining from Corsodyl Original Mouthwash (chlorhexidine digluconate) is not permanent, although professional scaling and polishing may be needed for complete removal, and stained front tooth-coloured restorations with poor margins or rough surfaces may need replacement if professional cleaning is inadequate.