Answer

In Jain fasting, you can start by taking a simple vow in the morning with a pure mind, according to your capacity.

About brushing:

• If you are doing complete fasting with only boiled water, many Jains avoid brushing after starting the fast, because toothpaste/powder and water use may disturb the strictness of the fast.
• If you brush before taking the vow, early in the morning, some people do so according to family tradition.
• For stricter fasts like Upvas, many follow the rule of not brushing, not eating, and only taking boiled water during the allowed time.

It is best to follow your family/guru tradition.

Explanation

To begin fasting:

• Wake up early.
• Do Navkar Mantra with devotion.
• Take a clear intention: “Today I will observe this fast peacefully and with self-control.”
• Avoid anger, lies, gossip, and unnecessary activities.
• If your fast allows water, drink only boiled and cooled water during the proper time.

If you are new, start gently:

• Navkarsi – eating after sunrise and Navkarshi time.
• Chauvihar – no food or water after sunset.
• Ekasan – eating once in one sitting.
• Upvas – full-day fast, according to your strength.

Spiritual Understanding

Jain fasting is not only about not eating. It is for:

• controlling desires,
• reducing attachment to taste,
• purifying thoughts,
• practicing self-discipline,
• moving closer to the soul’s true nature.

Takeaway

If you are just starting, do not force yourself. Begin with a small vow like Chauvihar or Ekasan, and ask your Jain elder, teacher, or guru about brushing rules followed in your tradition.