It is transmitted on the authority of Abu Hurairah (RA) that Allah's Messenger (ﷺ) said: The molar tooth of an unbeliever or the canine teeth of an unbeliever will be like Ubud and the thickness of his skin a three night's journey.
Hadith Referenceصحيح مسلم / كتاب الجنة وصفة نعيمها وأهلها / 2851