Drinking water after tooth extraction feels sweet may be caused by the anesthetic effect has not disappeared, a small amount of blood seepage from the tooth extraction wound, damage to the lingual nerve during tooth extraction, salivary gland damage, etc., as follows. 1. The anesthetic effect has not disappeared: the taste sensation of the front 2/3 of the tongue is dominated by the taste fibers of the tympanic cord involved in the lingual nerve, and when the anesthetic effect of the anesthetic lingual nerve has not disappeared, the taste sensation has not returned to normal, and there may be a sweet taste when drinking water. 2. Small amount of blood oozing from the tooth extraction wound: There may be a small amount of blood oozing from the tooth extraction wound due to the tearing of the gums, etc., and there may be a sweet taste when the blood is mixed with water. 3. Damage to the lingual nerve: The lingual nerve may be damaged during tooth extraction, resulting in an abnormal sense of taste and a sweet sensation when drinking water, which is most common after mandibular wisdom tooth extraction. 4. Damage to salivary glands: During tooth extraction, local salivary glands or ducts may be damaged due to slippage of instruments, resulting in a decrease in salivary secretion, resulting in dryness of the mouth, causing an abnormal sense of taste and a sweet taste when drinking water. Drinking water after tooth extraction may feel sweet for other reasons, if the above symptoms occur, it is recommended to go to the hospital in time, early targeted treatment.