Yes, hypothyroidism can cause dental problems. One of the most common problems associated with hypothyroidism is gum disease. Gum disease is an inflammation of the gums that can eventually lead to tooth loss. People with hypothyroidism are more susceptible to gum disease because the condition lowers the body's ability to fight infection. In addition, people with hypothyroidism may also experience dry mouth, which can lead to raised levels of bacteria in the mouth and an increased risk of cavities. Other dental problems associated with hypothyroidism include tooth decay, Halitosis (bad breath), and enamel wear. You must see your dentist regularly for checkups and cleanings if you have hypothyroidism.