Have you ever noticed a metallic taste in your mouth? Generally, our patients describe this phenomenon as a taste of metal, iron and rust that appears for no apparent reason.

We dentists are aware of several factors that may cause a metallic taste in the mouth. We should however start by saying that this metallic taste is similar to the taste of blood; it is therefore normal that you may have difficulty identifying the origin of this peculiar change in taste.


While a metallic taste in the mouth is not a disease, it is an indication that something is not right

If the metal taste continues for hours or even days, it may be telling you that you have a problem. Here are the 7 common causes of that metallic taste in your mouth:

  1. Poor oral hygiene. Failing to brush your teeth properly after every meal may lead to an infection of your teeth and gums. The reason for a metallic taste on your tongue may be related to tooth decay, gum inflammation or even gum disease.
  2. Antibiotics, tranquilisers, antidepressants or oral products containing chlorhexidine. Taking medicines of this kind, or the prolonged use of gel, toothpaste or mouthwash containing the oral disinfectant chlorhexidine can cause this bad If this happens, consult your doctor.
  3. Allergies or infections. The taste may be the side effect of a problem such as sinusitis or In this case, treatment for a metallic taste in the mouth must be decided by a doctor specialising in the matter.
  4. Diseases such as diabetes, liver or kidney problems. The dry mouth experienced by people who are affected by these diseases can have a negative effect on the tissues of the mouth, prompting changes in their taste and breath.
  5. Chemical exposure to certain metals such as mercury or lead, or changes in your body minerals. Some patients experience a metallic taste due to having high levels of iron, copper or zinc. This may be caused by taking over-the-counter dietary supplements without professional supervision.
  6. Hormonal alterations. During certain physical processes, such as pregnancy, women may experience a change in taste which will disappear after the first three months.
  7. Cancer treatment. Patients undergoing chemotherapy or radiation therapy may also experience this kind of symptom.


We recommend that you visit your doctor or dentist to study the cause of the problem. While waiting for the day or time of your appointment, you can help to relieve the metallic taste at home by improving your oral hygiene, chewing gum or eating a sweet – sugar free, of course.

If you need us to study the condition of your mouth or want to know more about the metallic taste in your mouth, call us. Ask for an appointment and our medical team will study your case at our dental clinic in Amara, Donostia (San Sebastián).