I brushed my teeth a little too hard and bled a bit. a few hours later i took a sip out of someone else's drink. does this pose a risk for hiv?

No: If that person does not have HIV, there is no risk. Even if the person has HIV, your risk is almost non-existent. You may consult this site for information: https://www.cdc.gov/hiv/basics/transmission.html For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex, if you have sex. Get HPV vaccine

HIV: No, alive seems to act as a barrier to the HIV virus. Of greater concern is the damage that you did to your gums. Gums should not bleed on brushing. Important that you see your Dentist ASAP to check your gum tissues.

No: HIV is not spread through saliva. Even if other person had HIV, your risk would be next to none. You still should not share drinks regardless, there are other diseases and viruses that can be spread through saliva.

Possibly,: since HIV is spread by body fluids contacting mucous membranes whether cut or not.

No: As it turns out the mouth is a very inhospitable environment for the HIV virus. Exposure levels need to be very high. The mouth is the bodies first line of defense against pathogens. There is alway a very slim possibility but very slim.