Chalky<br>Hank's mouth felt sort of weird. He'd just gotten a composite resin filling the day before. Now there was a chalky taste and the feeling of something artificial. Hank read that alcohol could wear away the rosin material. He decided to binge on coffee to wash away the taste.
Binging on coffee will not damage resin fillings.
The text only says alcohol can damage resin, so it is unclear the effect of coffee.