Your wudu or ghusl is valid even if there are some food particles left between your teeth, but it is better to remove them.
Ruling on doing wudu when one has food particles between one’s teeth
Question: 2166
When we eat we get food particles between our teeth. If we do wudu or ghusl and we cannot remove these food particles, is our wudu or ghusl valid?
Answer
Praise be to Allah, and blessings and peace be upon the Messenger of Allah.
Source:
Fataawa al-Lajnah al-Daa’imah, 5/234
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