I do not know of any basis for doing that, rather the deceased should be washed with wudoo’ then ghusl. If the miswaak is used when rinsing out his mouth there is nothing wrong with that, as in the case of the living.
Ruling on cleaning the teeth of the deceased with miswaak
Question 43079
What is the ruling on cleaning the teeth of the deceased with miswaak?.
Answer
Praise be to Allah, and blessings and peace be upon the Messenger of Allah:
Funerals and rulings on graves
Source:
Kitaab Majmoo’ Fatawa wa Maqalat Mutanawwi’ah li Samaahat al-Shaykh ibn Baz– vol 13, p. 115
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