MILLIONS of people who use an electric toothbrush are putting themselves at risk of a silent killer by using them incorrectly, dentists warn.

New research has found almost half (41 per cent) of all electric toothbrush users fail to switch the heads regularly enough, leaving them "less effective".

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Meanwhile, three per cent of the 1,000 Brits surveyed said they do not change their electric toothbrush head at all.

It comes as several studies have linked poor oral hygiene to Alzheimer's disease.

Top dentist, Dr Nigel Carter OBE, chief executive of the Oral Health Foundation said: “Worn out toothbrushes cannot clean your teeth properly and may damage your gums.

"When bristles become splayed, they do not clean properly."

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Some 30 per cent of Brits said they couldn't remember how long it had been since they changed their toothbrush head, in response to the survey conducted by sustainable wellness brand .

The experts suggest changing electric toothbrush heads every three months to maintain good oral health.

Not cleaning your teeth correctly can cause plaque to build up on the teeth, potentially leading to periodontitis, otherwise known as gum disease.

Previous research has said the bacteria known to cause periodontitis - F. nucleatum - might be involved in causing Alzheimer’s.

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Dr Davinder Raju, Dentist and Founder of Green Dentistry, added: "Cleaning your teeth and gums is essential to help keep your beautiful smile and ensure you remain healthy and vital for life.

"Unfortunately, over time, bristles that become frayed or worn out on a toothbrush become less effective at removing plaque and bacteria from your teeth and gums.

"Therefore, changing toothbrush heads every three months or sooner is advisable to ensure all-around health."

Take care of oral health

Having good oral hygiene will generally protect you from gum disease, but unfortunately, the older you get, the more susceptible you are.

Daily oral hygiene and plaque control can prevent gum disease, but you should also visit the dentist every six months.

To effectively look after your oral health:

• Brush your teeth with fluoride toothpaste at least twice a day – spit after brushing, do not rinse
• Clean in between your teeth every day using floss or interdental brushes
• Replace your toothbrush every one to three months
• See a dentist and dental hygienist for regular check-ups, especially if you're pregnant or have type 2 diabetes
• Stop smoking