This is chamomile in brandy. A classic and simple relief for teething children.  For this purpose, one would simply rub a drop or two onto the area as needed.  Chamomile is one of the most versatile, effective and gentle herbs in the world. Useful for digestive concerns, aids in sleep, a gentle antimicrobial, and relaxant. 
listing is for a 1 oz amber Boston round bottle with dropper.