* Natural: Some individual’s teeth are naturally yellow in color. This is no defect as not all of us are lucky enough to have naturally white teeth. Here is the detailed reason for this natural yellow color. The outer most covering of the teeth (enamel) is white.

However, the layer below this, which is the dentin, is naturally yellow. In some conditions, the outermost layer is not well mineralized causing it to become translucent. This makes the color of the dentin (yellow) more apparent and you can’t change this natural tooth color unless you use advanced whitening methods. * Aging: You have to accept the fact that yellowing of teeth is also a natural aspect of aging. However careful you might have been in maintaining your oral hygiene, over a long period of time staining agents generally seep in to your teeth giving it a yellowish tinge. Also, the enamel wears down and the natural yellow color of the underlying layer (dentin) becomes visible.

* Oral hygiene: Poor Oral hygiene is a major cause of yellow teeth colour. You could say “yellow teeth can have various causes” but poor oral hygiene ALWAYS result in yellow teeth(along with a lot of other dental problems)

* Food Habits: The chromogenic (COLOUR IMPARTING) food and beverages we consume can be held responsible for a vast majority of tooth discolorations. Foods such as tea, coffee, soda and berries have colour imparting properties. Smoking and chewing tobacco causes stained teeth as well due to nicotine deposits on teeth.

Here I'm sharing some of the Important Points to prevent Yellowing of teeth:
Don'ts
* Don't use your
fingernail to remove tooth stains, as your teeth are not hard as a rock. Fingernail can actually scratch the enamel which will led debris to lodge in the enamel thus worsening the situation by making the tooth more prone to tooth cavities.
* Do not use lemon or anything that has Vitamin C on your teeth. Lemon helps your teeth to become white as it reduces the major component of your healthy teeth, 'calcium'. Once it is lost it is susceptible to decay.
* Avoid excess intake of coffee, tea, red wine, carbonated drinks and smoking.
* Also avoid too hot and too cold drinks.