The document discusses the composition of dental adhesives. Total etch adhesives generally contain 95% inorganic material and 5% organic, while self etch adhesives contain 88% inorganic and 2% organic, with the remainder being water. Particle sizes in adhesives range from 5-50 micrometers. The inorganic content of bonded teeth is approximately 70% inorganic and 20% organic, with 10% water. Deeper layers contain 50% inorganic, 25% organic, and 25% water. Total etch and self etch are the two main types of dental adhesive systems.