Apart from smoking eradicating our good health it also makes our teeth look yellow, nicotine and tar are responsible for this cause. It is somehow stopping us to stand confidently in front of people around us. Coffee: While working late night coffee acts as a catalyst in the course of completing the job. But, we never think of the concentrated caffeine affecting our teeth and resulting in the yellowish appearance of our teeth. Aerated and drinks: Soda in the aerated drinks makes the outer layer of teeth erodes. Desserts and sweets are usually foods that make our teeth unhealthy. Causes of Yellow Teeth It is difficult to keep a check on our habits every now and then and curb the intake of harmful substances which degrades our teeth and health at the same time. Oral cavities give rise to other deadly diseases