Cadbury faced a critical problem when worms were found in some of its Dairy Milk chocolate bars manufactured in India. This led to a drop in sales of 30% as its reputation was damaged. To address the issue, Cadbury completely overhauled its packaging, investing heavily in new machinery to implement double packaging sealed with aluminum foil and plastic. It also launched an advertising campaign with Amitabh Bachchan to regain consumer trust. These efforts were successful, as Cadbury was able to recover its leading market share position in India and has not faced any product issues since.