We're always hearing about how important it is to brush your teeth twice a day.
Most dentists recommend doing so to avoid the build up of plaque, which can cause tooth decay, gum disease, and bad breath.
However, it is equally just as important not to brush your teeth, according to Dr Shaadi Manouchehri.
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The London-based dentist has shared the three situations you should 'never ever ever brush your teeth'.
Situation no.1
The dentist says it's really important not to brush your teeth straight after you've just vomited.
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"This is probably all you want to do after you've vomited, but actually the contents of the stomach are extremely acidic, and your teeth are made up of minerals," Dr Manouchehri explains.
"So when the contents of the stomach have come into the mouth, then the mouth is very acidic.
"And if you brush straightaway, you're rubbing that acid onto the tooth even more. So wait at least 30 to 60 minutes before you brush your teeth. What you can do instead is rinse out with some mouthwash to begin with and drink some water just to help neutralise that acid quicker."
Situation no.2
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This one is going to irritate quite a few coffee drinkers, so I apologise in advance.
"Next up, never brush your teeth after you've just had coffee," the dentist said.
"Coffee is quite acidic and especially if you add milk and sugar that can make the acidity even worse.
"Exact same concept, if you go and brush your teeth straightaway, you're rubbing acid onto the tooth and wearing the tooth away.
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"Wait at least 30 to 60 minutes, you don't actually have to brush your teeth, just rinse out with some mouthwash or drink water."
Situation no.3
This ties in with brushing your teeth after your morning coffee as Dr Manouchehri says: "Don't brush your teeth after breakfast, brush them beforehand because if you brush straightaway, you're going to be damaging your enamel.
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"And actually when you first wake up in the morning, you have quite a lot of bacteria in the mouth and that needs to be brushed before you have your breakfast."
Taking to the comments section, one person thought: "That’s why I brush my teeth first thing in the morning, I don’t understand people who don’t."
"Brudda i threw up like 30 mins ago and brushed my teeth :(," a second penned.
"I’ve been brushing after coffee (breakfast) for like 10 years," added a third.
"I do all of these and my dentist tells me my teeth are some of the best they’ve seen," a fourth wrote.
Anish Vij