mouthwashes are absolutely safe to use unless n until a person is allergic to any ingredients used in the mouthwash. always read the instructions how to use a mouthwash and how much to dilute it. when you use it with proper instructions it doesn't cause any problem if swolled little bit also.
flossing is a very important and useful oral hygiene measure. one should floss daily especially at night. it doesn't cause any harm to teeth or gums. it is just a myth that it weakens the teeth.
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