ANSWERS: 1
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This link will help you. https://scholar.google.co.in/scholar?q=periodontal+diseases+its+symptoms+and+its+measures&hl=en&as_sdt=0&as_vis=1&oi=scholart&sa=X&ved=0ahUKEwivx-KP_KrTAhVMRY8KHWiaAccQgQMIKDAA
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