In Jain dharma, the main issue is ahimsā (non‑violence) toward even very small living beings, including yeast and other micro‑organisms.

1. What is yeast and fermentation?

• Yeast is a living organism.
• In bread/pav, yeast is added to dough so it multiplies and ferments (rises).
• When we bake the bread, those countless living beings are killed.

From Jain point of view, himsa has already happened in the process itself (multiplying and then killing so many jīvas), even if the bread now comes packed in a packet.

2. General Jain view on bread/pav with yeast

• Both Digambar and Shwetambar maryādā traditionally discourage or avoid:

- Yeast breads, pav, fermented bakery items - All fermented foods (idli, dosa, vinegar, alcohol, etc.) ( jainknowledge.com)

• Especially on Paryushan, Aatham, Chaudas, vrats, etc., yeast/bread is not allowed. ( jainknowledge.com)

So, packet pav or bread made with yeast is generally not considered suitable Jain aahar, especially for anyone trying to follow ahimsā more strictly.

3. What about normal (non‑festival) days?

• Practically, some lay Jains do eat bakery bread on ordinary days.
• But stricter Jains and most traditional guidelines say to avoid yeast/fermented bread altogether, not only during Paryushan. ( jainknowledge.com)
• Spiritualy, avoiding it is a higher standard of ahimsā.

4. Better options (both traditions)

• Prefer fresh, unleavened items:

- Roti / chapati / phulka - Khakhra, thepla (without fermentation, no curd/eno, etc.) - Home‑made “bread” or baked items using no yeast and no fermentation (only flour, water/milk, ghee/oil, a little baking powder if needed). ( jainknowledge.com)

5. Short answer to your question

• Pav/bread made with yeast, even if yeast is killed in baking and comes in a packed packet, is better treated as not allowed from a strict Jain‑dharmic viewpoint, because:

- It is based on deliberately cultivating and then killing living beings (yeast). - Fermented foods are traditionally discouraged in Jain aahar.

If you want to follow Jain principles more carefully, avoid yeast‑bread and pav, and use simple, fresh, non‑fermented alternatives instead.

You can read a related explanation here: “bread has yeast then how is it jain?”