Can I brush my teeth while fasting?

Last reviewed · Jun 29, 2026 · Not medical advice
Quick answer

Yes for most practical intermittent fasts; brushing teeth does not count as eating if you do not swallow toothpaste.

Step by step

01 Brush normally.
02 Do not intentionally swallow toothpaste.
03 Use water after if the taste triggers hunger.

The longer answer

This is mostly a practical or religious-rules question. For intermittent fasting, brushing is fine and can help with fasting breath.

Tip

Minty toothpaste may reduce snack cravings for some people.

Common mistake

Using breath mints with sugar and assuming they are the same as brushing.

Track in the app

Track the drink or first meal, fasting duration, hunger, energy, and whether you completed the planned fast.

Safety note
Educational only. People who are pregnant, breastfeeding, under 18, have diabetes, take glucose-affecting medication, have a history of eating disorders, or feel unwell should speak with a qualified clinician before fasting.

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