Experts share four common foods that are making your teeth yellow even if you brush twice a day

While we're constantly told to brush our teeth twice a day, experts have warned that some everyday food and drinks can still leave them looking yellow.

Funnily enough, our teeth are not naturally white and they gradually turn more yellow the older we get.

Parents might know that when a baby's white teeth are replaced by permanent teeth, they are more yellow by nature.

Listerine explains that 'as we get older, the outer layer of enamel on the teeth wears down and exposes the dentin layer of the teeth, which is more yellow'.

That said, four common features in many people's diets can increase the risk of enamel erosion.

Dark berries

Dark berries are widely considered a 'superfood' (Getty Stock Images)

While dark berries have exceptionally high concentrations of antioxidants, it's also what gives it that rich, dark colour.

"From blueberries to raspberries, berries with naturally dark colours can stain your teeth. That doesn't mean you have to stop eating your favourite berries though," Listerine says.

"Rinse your mouth with water after popping the juicy fruits in to help wash away the dark juices before they stick to and stain your teeth."

Wine

It's not just red wine (Getty Stock Images)

Red wine, made from fermented dark grapes, is 'a well-known offender', according to Listerine, who also note that even 'white wine can also cause stained teeth'.

"While the tannins in red wine are more likely to result in dark stains, high acidity levels in white wine can lead to yellow stains," they said.

Tomato ketchup

(Getty Stock Images)

Ketchup contains spices like cumin and turmeric that can stain your teeth over time.

Listerine recommends to have 'a good oral care routine in the morning and evening can help reduce staining'.

The professionals recommend regular brushing and flossing, drinking water after consuming stain-causing foods and drinks.

Fizzy drinks

Think we all know fizzy drinks aren't great for us in general (Getty Stock Images)

"Most of us may be familiar with the damage to our teeth that can be caused by the sugar in fizzy drinks, but many people don't realise they can also cause stained teeth," Listerine said.

"Many fizzy drinks contain high levels of acid that can lead to stains on your teeth. Using a straw may help reduce the staining effects by keeping most of what you drink away from your teeth."

The dental experts also stress that ageing, smoking, tooth trauma and poor oral hygiene can also contribute to discolouration.

This also goes for false teeth that 'can absolutely stain and turn colours over time'.