A tooth color depends on the composition and structure, the thickness of each tissue in which it is established. Yellowing of teeth can be substances that stain the enamel and plaque buildup. One of the most effective natural remedies for teeth whitening is baking soda.
"homemade shampoo: use a clear bottle. Add some castile soap. Add water to roughly equal 3-4 x the original volume (just eyeball it, then shake the whole thing up). When you start this, your hair will feel greasier than ever. That’s because your scalp is still used to being washed with engine degreaser, so it takes a little time (about a week) for it to settle down and stop producing so much oil. After an adjustment period though, it’s all good."