Final answer:
The demand for dental services is elastic, as the quantity demanded changes by a higher percentage than the price change.
Step-by-step explanation:
The concept in question pertains to price elasticity of demand, which measures how much the quantity demanded of a good responds to a change in the price of that good. When the quantity demanded of dental services increases by 55 percent following a price decrease of 10 percent, this indicates a high responsiveness of quantity demanded relative to the price change.
The elasticity calculation here is 55 percent divided by 10 percent, which equals 5.5. This value is greater than one, signifying that the demand for dental services is elastic.