According to ADA specification of toothbrush width of brush head should be:
**Core Concept**
Toothbrush width is a critical factor in maintaining good oral hygiene, and the American Dental Association (ADA) has established specifications for toothbrush design, including the width of the brush head. The ADA guidelines are intended to ensure that toothbrushes are effective in removing plaque and bacteria from the teeth while also being comfortable to use.
**Why the Correct Answer is Right**
The correct answer is based on the ADA specification that the width of the brush head should be at least 1 inch (2.5 cm) to ensure effective plaque removal and to accommodate the natural shape of the human mouth. This width allows for easy access to all areas of the mouth, including the back sides of molars and the chewing surfaces of the teeth.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not meet the ADA specification for toothbrush width.
* **Option B:** This option is incorrect because it is too narrow and may not be effective in removing plaque and bacteria from the teeth.
* **Option D:** This option is incorrect because it is not a standard width and may not be comfortable to use.
**Clinical Pearl / High-Yield Fact**
When selecting a toothbrush, it's essential to choose one that meets the ADA specifications, including a brush head width of at least 1 inch (2.5 cm). This will ensure effective plaque removal and help maintain good oral hygiene.
**Correct Answer: C. 1 inch (2.5 cm)**