Hi, It is generally recommended to continue taking medications such as Plavix and aspirin as prescribed by your doctor, even before dental procedures. However, it is important to inform your dentist or periodontist about all medications you are taking, including blood thinners, as they may increase your risk of bleeding during the procedure. Your dentist may adjust your medication regimen as needed to reduce this risk. As for the use of Arestin, it is a local antibiotic treatment that is commonly used to help prevent infection after scaling and root planing procedures. It is typically recommended in cases where there is evidence of active gum disease and deep periodontal pockets. Your dentist or periodontist will evaluate your specific case and determine if Arestin is necessary for you. It is important to note that while antibiotics can be effective in preventing infection, their overuse can also lead to antibiotic resistance. Your dentist will weigh the benefits and risks of antibiotic treatment in your case and make recommendations accordingly. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Priyanka, General & Family Physician