A bright white smile is often seen as an indicator of good health. It is normal to notice your teeth looking yellower over time. You are experiencing a common dental issue; one that is not solved by brushing your teeth harder or more often.
Environments such as Singapore can exacerbate tooth discolouration. The availability of quick-service meals, food delivery, a cultural habit of eating out, and a fast-paced lifestyle can contribute to yellow teeth. Furthermore, certain genetic predispositions and underlying medical factors also contribute to yellowing teeth.
What Causes Yellow Teeth?
Tooth stains fall into two categories, extrinsic and intrinsic stains:
- Extrinsic (surface level) stains: These stains are found on the surface of the enamel, which is the outer layer of your tooth.
- Intrinsic (internal) stains: These stains are found in the tooth structure and may affect the outer protective layer (enamel) or the layer below the enamel called the dentine. Dentine is naturally yellow in colour and becomes more visible over time as the enamel wears away.
Understanding the differences between these two types of stains is essential, as it can help you select the most appropriate treatment and establish preventive strategies against future tooth discolouration.
Common Causes of Extrinsic Stains
Local Food and Drink
Singapore’s diverse and rich food culture exposes us to a variety of food colouring and pigments in our daily meals. Certain foods and drinks contain strong pigments, together with acidic properties, that can stain teeth over time with heavy consumption:
- Coffee and Tea: The high concentration of tannins in coffee and tea makes the enamel easily discoloured by these drinks. Your daily intake of kopi or teh can cause stubborn tooth yellowing in the long term.
- Curries, Sauces, and Gravies: Curry, soy sauce, and sambal are rich in colourings that stick to the tooth enamel.
- Sugary and Acidic Drinks: Carbonated drinks, isotonic drinks, and fruit juices are all highly acidic. The sugar and acid in these beverages soften and corrode the tooth enamel, making it vulnerable to erosion and staining.
Poor Oral Hygiene Habits
Inconsistent brushing and flossing allow plaque deposits to build up on the tooth enamel, which creates a rough surface and enables food and beverage pigments to easily cling to the teeth, leading to more discolouration.
Smoking and Using Tobacco
Nicotine and tar are the biggest causes of tooth discolouration. Enamel is penetrated by nicotine and tar. Both oxidise and stain the teeth yellow. Side note: Aside from leaving unsightly stains, nicotine and tobacco also cause oral cancer and other oral health ailments! Not good for you!
Common Causes of Intrinsic Stains
Intrinsic discolouration happens within the tooth’s inner structure, the dentine. It is more difficult to treat and you will need the help of a dental professional. The five main causes of intrinsic stains are:
- Genetics: You could be genetically predisposed to have thinner tooth enamel, which makes the underlying yellow dentine more obvious, and increases your chances of having yellower teeth.
- Ageing: Tooth enamel gradually wears away as you age.
- Medication: Some antibiotics, such as tetracycline and doxycycline, may cause permanent discolouration of the teeth.
- Trauma: Injuries to the tooth can cause pulpal nerve damage, making the tooth darken over time.
- Fluorosis: Excessive fluoride intake during childhood may cause discoloration and leave patchy yellow stains on the teeth.
Strategies to Prevent Yellow Teeth
The best solution for yellow teeth is prevention, and the first steps you can take are on a personal lifestyle level:
- Brushing and flossing your teeth consistently; twice a day is ideal.
- Drinking more water, especially after meals, to neutralise the acidic and staining effects of food and drink.
- Using a straw to minimise a drink’s contact with your teeth.
- Cutting down on soft drinks and acidic juices.
Professional Dental Solutions
If your stains are more severe or stubborn, a visit to a dental clinic can offer a range of solutions:
- In-clinic teeth whitening: Your dentist will first protect your lips and gums with a resin or rubber dam to ensure only the surface of the teeth is exposed to the whitening agent, A high-concentration hydrogen peroxide or carbamide peroxide gel (often between 15% and 43%) is then applied to your teeth to rapidly whiten your teeth.
- Custom take-home kits: If you prefer a more gradual approach, your dentist can create custom-fitted trays, and provide you with a professional-grade whitening gel to use at home.
- Regular dental check-ups: Professional scaling and polishing are recommended for removing stubborn extrinsic stains that brushing at home cannot remove.
- Dental veneers and crowns: For more severe intrinsic discolouration, permanent alternatives, such as veneers or crowns, can provide a long-lasting solution by covering discoloured teeth with a thin shell or cap made of porcelain/zirconia.
If you are concerned about the colour of your teeth and are looking for dentists that offer teeth whitening in Singapore, consider booking an appointment at An Dental. Our experienced dentists can provide advice and recommend a tailored treatment plan to help you achieve a healthy smile.
