Sensiodyne, burts. Brutes bees products with beeswax are helpful. Change toothpaste to sensodyne. Avoid alcohol containing mouthwash- therafresh can help with dry mouth. Also if this is associated with dry mouth co q 10 has been reported to be useful. Moth greatness can have very dry lips so reason for mouth breathing must be addressed.
Petroleum jelly! Regular use of Vaseline or petroleum jelly can be helpful.