Hello sir on 25 jan2025 I visited a dentist clinic for wisdom teeth pain and he scaling blood come in gum sir I am in tension that I don't know doctor use Sterilised instruments or not .... I have lot of fear of hiv . Infection after that i have stomach infection since one month my gut health disturb I have done 4th gen hiv test HIV Ag/Ab after 23 days it's come negative sir it's ok or should I retest after 42 days