Question
I know that it is permissible to use siwâk toothsticks while fasting. However, can a person brush his teeth with toothpase, or would this break his fast?
Answered by
the Fatwa Department Research Committee - chaired by Sheikh `Abd al-Wahhâb al-Turayrî
It will not break your fast unless you swallow the toothpaste.
However, without going so far to say that it is
makrûh to use toothpaste while fasting, Sheik Ibn al-`Uthaymîn discourages it. He says:
There is nothing wrong with a fasting person using toothpaste, as long as it does not go down his gullet. However, it would be better to refrain from using it, simply because it has a strong tendency to go down a person’s throat while he is unaware.
For this reason, the Prophet (peace be upon him) said: “Exaggerate in inhaling water (while performing ablutions) except when you are fasting.”
Therefore, it is better for a fasting person to refrain from using toothpaste. The matter is easy. If he simply waits until after he breaks his fast to brush his teeth with toothpaste, he will have avoided what might possibly nullify his fast.
And Allah knows best.

http://en.islamtoday.net/quesshow-56-1704.htm

another site said
Praise be to Allaah.
Shaykh Ibn Baaz (may Allaah have mercy on him) was asked about using toothpaste whilst fasting. He said: there is nothing wrong with that so long as one is careful to avoid swallowing any of it, just as it is prescribed in Islam for the fasting person to use the siwaak (tooth-stick)
Fataawa al-Shaykh Ibn Baaz , 4/247
Shaykh Muhammad al-Saalih ibn ‘Uthaymeen said:
… This leads us to the question: Is it permissible to use a toothbrush and toothpaste whilst fasting or not?
The answer is that it is permitted, but it is preferable not to use them because the toothpaste is too strong and may go down into the throat. Instead of doing that during the day, one should do it at night.
Al-Sharh al-Mumti’ by Ibn ‘Uthaymeen,

https://islamqa.info/en/13619

No wonder the population of people with mouth odour is always high during these period . CLEANINESS IS NEXT TO GODLINESS .

yanks for the lesson, may allah reward you

Tocheagle:
No wonder the population of people with mouth odour is always high during these period . CLEANINESS IS NEXT TO GODLINESS .

Plus BO