Why is brushing teeth immediately after consuming highly acidic citron fruit discouraged?

Brushing scrubs away enamel that has been softened by acid exposure

A critical recommendation for minimizing dental harm from highly acidic fruits involves the timing of oral hygiene practices. When enamel has been subjected to strong acids like citric acid, its surface temporarily becomes softer and more vulnerable to mechanical abrasion. If one brushes their teeth immediately following consumption, the physical action of the toothbrush, combined with the abrasive particles in toothpaste, can scrub away this temporarily weakened enamel layer much faster than usual. To allow the enamel adequate time to re-harden—a waiting period generally recommended to be between 30 to 60 minutes—it is advised to first rinse the mouth thoroughly with plain water before proceeding with brushing.