Plaque is able to cause bad breath & yellowing. Attention is taken to the fine part in between the teeth which it's difficult to take with a toothbrush. The tip part is finished with an optimum advantage for usage exactly one by a single. Hardened stainless steel utensils is difficult to rust & can be used for a long time. When you want to boil, make sure you don't boil in boiling water for more than fifteen minutes. Moreover, it becomes warm following disinfection & there's a risk of skin burns. Don't touch with bare h&s when taking out.