I have had novacaine for years with little or no problem. This past time I went in for a filling and the novacaine numbed everything but the tooth. As a matter of fact I could not blink my eye. It was literally frozen open. The whole side of my face was frozen. Is this unusual or what? I have never heard of it happening and now am terrified to go back. Has anyone ever heard of this and how common is it. Thanks.