How to help my teeth?

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i have been facing this problem for a long time now.i have a tedency of being attacked by tooth decay very much.i already have said my two teeth goodbye because of execessive tooth-cavity.and i am scared,many are being affected because for the past few days.i have been feeling some pain in my teeth of my upper right gum.Do you know what to do and how to save my teeth.any remedies,or any medicne?