Sayang, ini really depends on which anesthetic & how it's given, kena tanya doctor kau directly, ok? Most modern anesthetics are actually considered safe for breastfeeding, tapi timing & type tu yang penting. Definitely see your doctor or dentist before any procedure & tell them you're breastfeeding, they boleh adjust & advise you properly. A few of my mum friends had dental work while nursing & doctor dia just advised on timing, so it's normally ok, tapi you need professional confirmation for peace of mind! Don't stress, just get it checked first.