Suitable for both adult & children, user can custom fitted your mouth's size put in warm water within 50second and bite it fixed shape of your tooth. After that cutting (the depth) easily with scissor. Asians' mouth size generally btw 4 to 6.3cm depth & 4 to 7.5cm width, thus for mouth guard to be put in the mouth comfortably, the advisable size for this mouth guard is btw 4.5 to 5.5cm in depth & 5 to 6.5 cm in width. Material is Baby Pacifier Type. Color is Translucent.