Even the roots turned black… ‘This’ is more lethal than coffee when it comes to teeth staining

‘This’ is more lethal than coffee when it comes to staining your teeth, making it even black at the roots.
Red wine was found to cause more severe tooth staining than cola or coffee.
Dr. Midison tested the teeth by soaking each of the four extracted teeth in coffee, tea, cola and red wine for 10 days.
No color changes or structural changes inside the surface are observed.
First, teeth soaked in red wine turn almost purple, causing both the tooth substance and the root of the tooth to become stained.