I do not know how long ago you had that experience at the dentist. However, this might help you to know that most dentist now will numb your gums before giving you a shot. You do not even fill any pain from the shots anymore. You also should explain to your dentist about your fears. Dentist are not in the business to cause any one any unnecessary pain.. They would not stay in business very long if they were. However if they know about your fears or concerns they can be a little more causious when treating you.