Crusty substance are the dried up saliva, and the residual food material struck over the rough surface of the tongue which gets smeared over the lips when you smack, with out your knowledge in the sleep. Drink plenty of water it will reduce drying of the mucosa and the secretions.
Regards
Dr. Naveen Kumar
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What Causes A White Crust On The Tongue In The Morning ?
HI Rachel, Crusty substance are the dried up saliva, and the residual food material struck over the rough surface of the tongue which gets smeared over the lips when you smack, with out your knowledge in the sleep. Drink plenty of water it will reduce drying of the mucosa and the secretions. Regards Dr. Naveen Kumar