Common dental problems include tooth decay, gum disease, bad breath, oral cancer, mouth sores, tooth erosion, tooth sensitivity, toothaches, and unattractive smiles. Many dental problems can be prevented through proper brushing, flossing, regular dental checkups, and a healthy diet. It is important to see a dentist if any dental issues like pain, bleeding gums, lumps or sores in the mouth arise, as some problems could lead to tooth loss or other health issues if left untreated.