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The most important is period for replacement cycle of toothbrush. It must change every 3 months due to the virus growth after 3 months later. But, most of people dont know the replacement cycle of Toothbrush, thats why they are using it until wear down it. It could be a cause of decay, gum disease and bad breath that the bristles on your toothbrush begin to wear due to the using the pass the period. After brush the teeth, it counts each one-time to put the Counter stand. The color counter visually shows that the replacement cycle of toothbrush turned red from white color after 3 month later in the 270th.
Yonsei University
Wonju, South Korea
kyungwon University
Gyeonggi-do, South Korea
Yonsei University
Gyeonggido, South Korea
Hongik University
Seoul, South Korea
Silla University
Gyeongsangnam-do, South Korea