Srimad-Bhagavatam: Canto 6 - Chapter 1 - Verse 43
Sanskrit:
पूषानपत्य: पिष्टादो भग्नदन्तोऽभवत्पुरा ।योऽसौ दक्षाय कुपितं जहास विवृतद्विज: ॥ ४३ ॥
ITRANS:
pūṣānapatyaḥ piṣṭādobhagna-danto ’bhavat purāyo ’sau dakṣāya kupitaṁjahāsa vivṛta-dvijaḥ
Translation:
Pūṣā had no sons. When Lord Śiva was angry at Dakṣa, Pūṣā had laughed at Lord Śiva and shown his teeth. Therefore he lost his teeth and had to live by eating only ground flour.