Pronunciation: [bɹˈʌʃ tˈuːθ] (IPA) 
The correct phrase is "brush teeth" not "brush tooth". The word "tooth" refers to only one, while the act of brushing requires one to clean all of their teeth. The phonetic transcription of the word "brush" is /brʌʃ/. The IPA symbol /r/ represents the sound of a rolled "r" which is made by vibrating the tongue towards the back of the mouth. To correctly pronounce "brush teeth", one should say /brʌʃ tiːθ/.
Brush tooth refers to the act of cleaning and maintaining oral hygiene by using a toothbrush to clean a single tooth. It is a verb phrase commonly used in the field of dentistry and oral care. Brushing tooth is an essential practice for the prevention of tooth decay, gum diseases, and bad breath.
To brush tooth correctly, one must wet the toothbrush under running water and apply a pea-sized amount of toothpaste to the bristles. Holding the toothbrush at a 45-degree angle to the tooth's surface, the person should gently move the brush back and forth in short, circular motions. This technique helps to remove plaque, food particles, and bacteria from the tooth's surface, preventing the formation of cavities and gum problems.
Brush tooth should be performed at least twice a day, preferably after meals, for approximately two minutes each time. It is advised to use a toothbrush with soft bristles and replace it every three to four months, or sooner if the bristles become frayed. Additionally, one should not forget to clean the backside of the teeth, along with the chewing surfaces and the tongue, as it also harbors bacteria.
Overall, brushing tooth is an integral part of maintaining good oral health and should be practiced regularly to prevent dental problems and promote a healthy smile.
The word "brush" comes from the Middle English word "brusshen", which originated from the Old French word "broisse", meaning "twigs" or "broom". It eventually evolved from French into the English word "brush".
The word "tooth" comes from the Old English word "tōþ", which can be traced back to the Proto-Germanic word "tanþs". Its origins can be further traced back to the Proto-Indo-European root "*dont(s)-", meaning "tooth".
So, the etymology of the phrase "brush tooth" can be traced back to the combination of the Old French word "broisse" and the Old English word "tōþ", which eventually developed into the modern English words "brush" and "tooth", respectively.
