LondonAndy, your doctor has it all wrong on the antiobitc regent for teeth, it is to prevent infection from the mouth to travel to the heart, encarditis, which a person can die from without antibotics, Best have another talk to your cardio about this. That is risking your life to an infection to the heart. Please check into this. In America, it is regulated so a dentist will not touch a heart peatien without being premedicated first. They will not touch us without it. I have been a heart patient for life, since the very day I was born, experience with this is my knowledge and try to make sure people know to premed before any tooth procedure, even a teeh cleaning. They have changed the dosage and how may pills to take, bue we have premed to prevent infection of the heart, encarditis, which can end in death of antiobotics are not used. A young lady, a heart patient, decided to skip the antiobtic regement and had infection in ther mouth. When she went home, she had a high fever. Was rush to the hospital, but she died later, too late to fight the infection, damage was done. So please talk to your cardio. Use the antibotics before even a teeth cleaning to prevent heart infection.