| 摘要 |
A tooth bleaching tray (20) broadly includes a U-shaped trough-like member (21) having a central arcuate portion (22) and having an extension portion (23, 24) continuing from either end thereof and terminating in a distal end (25, 26). The tray has an outer wall (28) adapted to face toward the outer surface of a person's teeth, an inner wall (29) adapted to face toward the inner surface of such person's teeth, and a bottom surface (30) joining the lower margins of the inner and outer walls. A thin flexible wall (31, 32) is located at each extension portion distal end (25, 26) and joins the margins of the inner and outer walls and the bottom surface. This flexible portion is adapted to conform to the shape of such person's rearwardmost molar without deformation of the trough-like member, and functions as a dam to prevent bleaching composition from flowing out of the trough-like member through the distal ends.
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