WhatsApp has now introduced disappearing message features for users all over the world.
Messages you send will disappear after 7 days of activating this feature.
This feature works in both individual and group chats. But in group chats only the admin can enable this feature.
Read :WhatsApp Hidden Tips
Complete details of this feature available on WhatsApp FAQ
How to Enable Disappearing Message Feature on WhatsApp ?
First of all make sure you update your smartphone to the latest version of WhatsApp.
Open the WhatsApp chat that you need to activate the disappearing massage feature.
Open their contact info
Tap ‘Disappearing message’
Tap ‘Continue’ on pop up and Select ‘On’ for enabling the feature