(p. 40) Historically, the Japanese have had poor dental care. As part of their beauty regimen, the Japanese do have a habit of lightening and whitening their skin. Teethart has developed "tooth manicure" salons, which allow Japanese to match their teeth coloration to their skin. Each treatment takes place in a private booth, which contains an ergonomically-designed chair, muted lights and New Age-style music. The walls are painted calming shade of blues and greens. By using physical evidence to reduce anxiety, Teethart is narrowing provider _____ of the gaps model of service quality.