###Human: Is there any way to cure brown stains from teeth permanently? ###Assistant: Hi. Just checked your given picture and thanks for detailed history (attachment removed to protect patient identity). These brown marks are because of smoking. You have not left me with anything to suggest you as you have already done with home remedies, peroxides, care, etc. Now, if you do not want these brown lines to come back you have to quit smoking for it. Correct your brushing technique. You have to brush your teeth with light hand pressure because I can see at some points you do brushing vigorously that caused enamel to wear off. I would say it is erosion and abrasion at gumlines, where you put a slightly more pressure to get rid of brown lines. You immediately need to stop this. Stop getting angry. Do not be surprised, as your teeth say so. I guess either you are introvert, do not express your feelings or pour out your anger on others and keep grinding your teeth instead or you are a person who takes stress too much. Is it so? Do let me know about it. I can say you are suffering from a condition called bruxism, that is, clenching of jaws or habit of grinding your teeth consciously or unconsciously at night. For it, you definitely need a night guard so your teeth might not get minor fractures or uneven occlusal surfaces can be arrested right away. This is just an additional finding I diagnosed by seeing your ground teeth. Regarding your presenting complaint, yes bonding will definitely work in arresting these gumline abrasions you made yourself by brushing harshly and smoking brown stains will also be limited by it. Rest, for getting permanently rid of it you need to leave your beer and smoke which are definitely injurious to your health. Do give me followup after next visit and after breaking down your habits.