What to do for sore taste buds in mouth have had tuis for 3 days

Identify cause. If it doesn't begin to improve within the next few days, you may want to see a doctor for an evaluation. In general the tongue is very quick to heal and it may not be anything at all. Could be something you ate (spices, cinnamon, or a tongue burn perhaps). If it doesn't resolve within 1-2 weeks i would most certainly see a dentist. If painful, over the counter meds or topical like orajel may help.