Over time, foods, drinks and smoking can cause your teeth to become discolored. At-home teeth whitening products are available to help promote a whiter smile. Whitening products work by either scrubbing away stains with abrasive ingredients or lifting them away with hydrogen peroxide or another chemical ingredient. Today, there are toothpastes, mouth rinses, strips and gels with whitening benefits for you to try. Be sure to consult your dentist for advice about which type is best for your smile.