P&G has developed a new toothpaste that provides tooth and gum protection for 24 hours after each

Question:

P&G has developed a new toothpaste that provides tooth and gum protection for 24 hours after each brushing. It would like to determine consumers' response to this new toothpaste before introducing it in the marketplace. If a survey is to be conducted to determine consumer preferences, which survey method should be used and why?