###Human: Are my teeth discolored due to cavities? ###Assistant: Hi. I have gone through your question and I can understand your concern. Yes, if it is brown or black that means it is in the initial stage of the cavity. It takes a year or two to start symptoms like sensitivity or lodging of food in these cavities. You need to keep your teeth clean through brushing twice daily. If you can upload a picture here so that I can tell you that if there is any immediate treatment or filling needed. The proper way to address the problem is to get a dental filling done (restoration).