How genes can affect your teeth and oral health

You may recognise a family resemblance in your smile. Genes help shape tooth development, and some dental conditions run in families. That does not mean you are destined to have the same dental problems as a parent or grandparent.

Oral health reflects several influences, including tooth structure, saliva, diet, medicines, smoking and access to dental care. Family history is useful information for your dentist, rather than a prediction of exactly what will happen.

Teeth that do not develop

Some people are born without one or more tooth buds, so the corresponding teeth never develop. This is called hypodontia. It can run in families, but it can also occur without an obvious family history.

A milk tooth may remain where there is no permanent replacement. A late adult tooth does not always mean it is missing, so an examination and, when appropriate, an X-ray are needed before deciding what to do.

Treatment is individual. It may involve keeping a suitable milk tooth, moving teeth to close a gap or planning a replacement such as a bridge, denture or implant. Implants are not an inevitable next step and are generally unsuitable while the jaws are still growing.

The Guy’s and St Thomas’ guide to hypodontia explains assessment and the main treatment options. A team of specialists may be involved when planning is more complex.

Enamel, shape and colour

Inherited conditions can affect how enamel forms. One example is amelogenesis imperfecta, which can leave enamel thin, weak or discoloured. It may affect both milk and permanent teeth and needs care tailored to the particular problem.

Not every white spot, yellow area or change in colour is inherited. Developmental changes, staining, decay and other causes can look similar. A dentist should assess a new or unexplained change before you try whitening it.

Natural tooth shades vary, and whiteness is not a reliable measure of health or cleanliness. Likewise, you cannot tell how resistant someone is to gum disease simply by deciding that their teeth look triangular or rectangular.

Can decay or gum disease run in a family?

The risk of tooth decay is not explained by genes alone, or by blaming parents for passing on “bad habits”. Plaque bacteria, frequent sugar intake, fluoride exposure, saliva and the condition of the teeth all matter. A prevention plan should address the person’s actual risks.

Genetics can contribute to susceptibility to periodontitis, a form of gum disease that damages the tissues supporting teeth. Smoking and diabetes are also important risk factors. A relative’s history of gum disease does not make tooth loss inevitable, and the absence of a family history does not rule it out.

Tell your dentist if close relatives lost teeth unusually early or have a diagnosed inherited dental condition. Bleeding or swollen gums, persistent bad breath or loose adult teeth need assessment at any age. A particular birthday is not a threshold below which gum problems can be ignored.

Care that fits your needs

Brush twice daily with fluoride toothpaste and clean between your teeth. Ask the dental team to show you an approach that is manageable if sensitivity, disability or another difficulty makes cleaning hard. Professional cleaning and further treatment may be needed, but they do not remove the need for ongoing care.

For children, arrange the first dental visit when the first tooth appears or by the first birthday. Our children’s tooth care guide covers the daily routine.

Your dentist can explain any findings and set out a treatment plan, including costs and follow-up. If you are considering instalments, check the current finance information rather than assuming that every treatment or applicant qualifies.

Contact the practice to discuss your concerns or family history. You do not have to work out whether a problem is genetic before asking for help.