Answer

In most Jain traditions, toothpaste is avoided during fasting, especially in strict fasts like upvas, because it can enter the mouth and may involve taste, stimulation, or accidental swallowing.

Explanation

Jain fasting is not only about avoiding food, but also about maintaining restraint and reducing bodily indulgence.

• Toothpaste has taste and ingredients that may stimulate the senses.
• There is also a risk of tiny particles being swallowed.
• Because of this, many Jains prefer to avoid it during a fast.

For oral hygiene, some people choose to:

• rinse with plain water
• clean the mouth gently without toothpaste

Spiritual Understanding

Jain fasting is meant to support:

• self-control
• non-attachment
• purity of conduct
• deep spiritual focus

Even small acts are judged by the spirit of the vow. So for a strict fast, avoiding toothpaste is generally seen as more aligned with Jain discipline.

Takeaway

If your fast is a strict Jain upvas, it is better to avoid toothpaste. For less strict observance or specific family tradition, practice may differ, but the safest traditional approach is to refrain.