Whiten Your Teeth in 7 Days from Home

Add a bit of Tooth paste in a Cup

Add and Mix Baking Soda ( 1 Tea Spoon)  with Paste.

Add Little Hydrogen Peroxide (1 Tea Spoon)

To get dilution add some Water (Minimal Quantity 1 tea Spoon).

Brush it for 1 or 2 Mins.

Footer Note:

1. Dilute it with water at least 50%, don't leave it in your mouth for more than 20 seconds. 
2. Don't Swallow Hydrogen peroxide (H₂O₂)
3. Don't use it this way more than once per day.