Imagine that in certain situations, you shouldn't clean your teeth, and all those habits we've been taught are now questionable.

Dr. Shadi Manoushahri, Clinical Director at Smart Dental Aesthetics and Director of the London College of Facial Aesthetics in England, caused a stir by suggesting avoiding toothbrushing after vomiting, having breakfast, or consuming sweets.

In a video that garnered over 12 million views, she explained that the reason to avoid brushing your teeth in these three scenarios is the mouth's acidity level (pH).

Dr. Manoushahri told Fox News Digital in an interview: "Your teeth are made of minerals, and acid can literally dissolve them. When we eat anything, whether it's breakfast, lunch, or snacks, especially sweet things, the bacteria on our teeth metabolize it and convert it into acid."

She added, "The same concept applies to vomiting. Clearly, stomach contents are highly acidic. So, if you brush your teeth immediately, you're rubbing acid onto your teeth, which can lead to damage."

The dentist emphasized that mouth acidity will eventually balance out over time, but during this period, it may take 30 to 60 minutes for saliva barriers to work effectively.

She recommended adopting practices such as drinking water, chewing sugar-free gum, and using alcohol-free mouthwash to allow more saliva accumulation, which helps neutralize the acid more rapidly.