The elderly always have loose teeth, exposed roots, swollen and flabby gums, easy to plug teeth, etc. When you go to the hospital dentistry, you must be alert to prevent cardiovascular disease caused by tooth extraction. This is because elderly people suffering from hypertension and heart disease complications may suffer from sudden increase in blood pressure due to psychological factors and painful stimulation, which may lead to cerebrovascular accidents; at the same time, they may also suffer from sudden drop in blood pressure, resulting in insufficient blood supply to the heart and brain and corresponding symptoms, which may lead to sudden death. Patients with severe cardiovascular disease should pay attention to the following when having teeth extracted: 1. Tension can cause blood pressure to rise in 36% of people, arrhythmia in 63% of people, and ischemic ECG changes in 12% of people. Therefore, before tooth extraction, you should dispel your worries and not be overly nervous. Taking sedatives such as Valium, Luminal and other drugs for the heart such as Tretinoin can help eliminate the effects of mental tension. 2. People over 70 years old with cardiovascular disease have poorer tolerance to tooth extraction and more chances of danger, so the need for tooth extraction should be decided after full consideration. 3. When anesthesia is not effective, 42% of people can have elevated blood pressure and 55% of people can have arrhythmia. After adequate anesthesia, it is safer to achieve painless tooth extraction. 4. For people with heart disease, the nature of heart disease should be determined first, whether it is congenital heart disease, rheumatic heart disease, myocarditis or coronary heart disease, etc. Patients with rheumatic heart disease and myocarditis should pay special attention to tooth extraction because it may cause temporary bacteremia and antibacterial injection should be given 2~3 days before tooth extraction to prevent inducing bacterial endocarditis. Patients with a history of angina pectoris and myocardial infarction should also be cautious when having their teeth extracted, and vasodilators should be taken before extraction. 5. Patients with hypertension are prone to bleeding after tooth extraction, so attention should be paid to compression to stop bleeding and application of antihypertensive and hemostatic drugs after tooth extraction. In addition, if hypertensive patients have heart, brain, kidney and other organ pathologies or heart failure has occurred in heart disease patients, they cannot have their teeth extracted. 6. During tooth extraction, if the blood pressure exceeds 180/100mmHg, antihypertensive treatment should be carried out first. At the same time, patients should be relieved of their worries and stabilize their emotions before tooth extraction. Some patients who are overly tense in their thinking will also have a sudden rise in blood pressure. Moreover, some studies have shown that those with periodontitis are 1.5 times more likely to have coronary heart disease and 2.1 times more likely to have a stroke than those with normal periodontal disease. The prevalence of gingivitis and periodontitis in patients with cardiovascular and cerebrovascular system diseases is as high as 87.5 to 90 percent. Patients prone to oral and gum diseases should pay more attention to the prevention of cardiovascular disease, especially cardiovascular patients should also pay attention to cardiovascular health checks after treatment of dental disease.