Tìm hiểu về sự đổi màu. Biết những rủi ro của bệnh tật. Thực hiện tốt vệ sinh răng miệng. Cố gắng bỏ thuốc.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
Nicotine can quickly cause yellowing of your teeth. This occurs whether you smoke cigarettes or use chewing tobacco. Nicotine and tar settle into the very small cracks in the enamel of your teeth, and cause discoloration. It has been shown that nicotine helps the process of plaque formation, which leads to a faster deposit of tartar and can cause bad breath. In addition to discoloration, nicotine use can cause other physical problems for your teeth and gums. You may be prone to increased cavitie