Gel-Like Parodontax Mouthwash & Short Expiry After Opening

I bought Parodontax mouthwash, and it has a gel-like consistency. I only discovered the expiration date once I opened the lid. It is recommended to consume it within three months after opening. We couldn't even use it for a single day. After coming across a few more complaints, I decided to do some research to investigate the consistency of the issue. To my surprise, the findings were quite peculiar.