All of my life I have had dental problems due to a lack of enamel on my teeth. Over the years I have seen the dentist more times than I care to count, but every time I have to get work done, the freezing does not work. my face will go numb but not the inside of my mouth. My dentist has tried every different LA available and nothing works. I can handle the pain for minor fillings but I am getting full dentures soon. I don't think that I can handle getting my teeth extracted without pain relief. I My dentist has tried IV sedation twice, but it does not help with the pain, it just stops me from jumping out of the chair. Any suggestions as to why this is happening or what to try nest would be greatly appreciated.