Some portions of my teeth are black. I am not a smoker or alcoholic person. This problem happened 2 years back at that time I went for scaling but after 6 months same problem happening. Some portions are black people think thai I took gutka but I never took. I am the only person who suffered from this problem in my family. Since 2 months I never took tea or coffee. But the problem remains the same. Should I go for scaling? Is this scaling or washing process is good for teeth again or again. Please suggest me any solution or paste regarding this problem.