The human brain can sometimes heal and repair itself overtime but whether or not the brain will be able to successfully heal itself will depend on how damaged the brain was.
In severe brain damage or when someone has suffered a stroke the brain is very unlikely to heal itself but sometimes it can.
If the stroke wasn't too severe then the brain can sometimes repair and heal itself by what's known as neuroplasticity.
The brain is an amazing thing and can usually heal after being damaged but as long as the brain cells didn't die.