Within the last three years my thyroid became very active. I was told I had hyper when I was 12 and now I am going to be 25. But just in last three years I have noticed that my teeth have become really bad. Decaying of my molars, sensitive to hot and cold, and jaw pain. My wisdom teeth are growing in but my dentist tells me that my wisdom teeth will not affect any other tooth unless it scraps the others. My gums were also tender and swollen for about a week. I was wondering if having a really over active thyroid would cause these problems. I should also tell you that my doctor is very worried that I could have a heart attack at any moment. I shake all day even with my meds, Propyl-thyracil. I am dizzy, can not sleep, always hungry, losing weight fast, some days my eyes are sore, and can have blurred vision. I hope you can tell me if hyperthyroidism can cause tooth decay? I am concerned I brush three times a day now and my teeth are still getting worse.