Tiny, many people have had a bad experience with the dentist. Modern dentistry is a far cry from what many are used to. I use computerised anaesthetic delivery systems to make the procedure much more comfortable. Occasionally the muscles around the injection site can become spre and it sounds like that is what happened to you. I am confident that it was not intentional although I can empathise this doesn't allay your fears. My ethos on care is to deliver treatment in a fashion and to the standard I would be happy having done on myself.
Modern dentistry is a wonderful thing, the range of procedures now available to help boost your confidence is superb. A good mentor and friend of mine from the States says (quite rightly) that the vast majority of people walk around being unhappy with their smile because they simply are not aware of what can be done for them
whitening can cause sensitivity but not always. Whatever sensitivity is caused by whitening is completely reversible afterwards
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