Dental implant surgery is a minor operation for replacing the tooth by drilling the titanium screw into the jaw bone. Postoperative pain happens because of tissue injury in conjunction with muscle spasms after the surgery. More than 75% of surgery patients suffer from acute pain. Vitamin C is a water-soluble vitamin that has an important role as an enzyme cofactor in human composition. It can reduce and prevent pain after surgery. Nevertheless, the effect of vitamin C on postoperative pain after dental implant surgery is still unknown. The main objective of this study, therefore, is to evaluate the effectiveness of 6oo mg of vitamin C for pain-relieving within the period of 3 days after the dental implant surgery. Twenty selected subjects were inserted with Straumann ^Ⓡ implant (BL, BLT, BLX) at the posterior area of the dental arch. Then, they were randomly divided into 2 groups, namely vitamin C and placebo groups. In the vitamin C group, participants were provided with a 2-daily dose of 600 mg vitamin C for 3 days after dental implant surgery. The other group received the placebo instead. The postoperative pain score, which applied the visual analog scale (VAS), was collected daily in the morning for 3 days after surgery. There were no differences in the participant’s age, sex, underlying disease, implant size, implant length, implant torque, and ISQ value (p > 0.05). The visual analog score showed that the vitamin C group had a statistically significantly lower postoperative pain score on day 1 after the dental implant surgery (p = 0.013) while day 2 and day 3 did not have any statistical significance (p > 0.05). Thus, vitamin C can be applied as an additional supplement for postoperative pain relief after dental implant surgery.