Could deepcleaning of teeth be dangerous if you have had angioplasty before?

No: If your dentist has recommended this procedure to treat periodontal disease, it is very important that you follow through with it. Periodontal disease increases the risk of cardiovascular disease. The fact that you have already had an angioplasty tells me you have a history of cv disease. Tereating the periodontal disease and anything else to lower your risk would be a very good idea.

No: Absolutely not. Regardless of what you may have ever heard about introducing oral bacteria into the blood stream, you are not at risk. If the angioplasty has been done longer than 6 weeks ago, stents are endothelialized within 6 weeks. Reduction in oral bacteria and inflammatory mediators will only make you healthier. People don't drop over dead from using toothpicks or flossing.