Applying henna to the hair whilst fasting
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Question: Is it permissible to apply henna to the hair whilst fasting and praying because I have heard that henna breaks the fast?

Response: This is not correct because applying henna whilst fasting does not break the fast and does not affect it in any way just as kohl, ear drops and eye drops don't either.

Shaykh Ibn 'Uthaymeen
Fataawa Ramadhaan - Volume 2, Page 530, Fatwa No.500;
Fataawa ash-Shaykh Muhammad as-Saalih al-'Uthaymeen - Volume 1, Pages 503-504