Dr. Suraj Kukadia, known as Dr Sooj, said on social media that brushing before breakfast is advisable because the fluoride in toothpaste provides a protective layer against acids in food and drink. He noted that orange juice is especially harmful, and brushing after eating can rub acid into teeth, wearing down enamel and gums. Dr Kukadia also recommended brushing twice daily: before breakfast and just before bed.
According to Daily Express - Health, Dr. Deepa Chopra from Whites Dental described brushing before breakfast as a good rule of thumb to remove overnight bacteria and plaque. She warned that brushing immediately after eating can damage enamel, which softens temporarily when consuming acidic foods. Waiting about 30 minutes allows saliva to neutralize acids naturally. As an alternative, she suggested rinsing the mouth with water after meals to wash away food particles and acids without harming enamel.