It's normal to feel worried, but dental offices follow strict rules to keep everything clean and safe. Tools are either sterilized or disposed of after use, so the risk of catching anything, like
HIV, is very low. If you're unsure, you can always ask the clinic about their cleaning practices. If you notice any unusual symptoms after your visit, contact your dentist. But overall, dental procedures are safe, and the chances of infection are minimal, so there is nothing to be worried.