Correct Answer - Option 4 : lower than 5.5
The correct answer is lower than 5.5.
- At the ph of 5.5, the teeth risk of cavities and tooth decay begins in the mouth.
- A healthy mouth is neutral Ph range. A teeth can actually become stronger and remineralize when the Ph of mouth is 7.5 or above.
- If the Ph of teeth maintained at the basic level the healthy bacteria within the dental plaque biofilm will not die and the shift to cavity-causing bacteria will not occur.
The role of toothpaste to prevent tooth decay is as follows-
- Fluoride is a mineral that can prevent tooth decay from progressing. It can even reverse or stop, early tooth decay. Hence most of the toothpastes have fluoride ions.
- Secondly, tooth-pastes have salts in them which decreases the acidity of mouth.