Demme showed great determination to get ahead of Freiburg defender Nicolas Höfler inside the six-yard box and head in a knock-down from Timo Werner in the 90th minute to net his side's final goal in a 4-0 victory that secured the eastern club a top four finish.
However, Höfler's attempt to make a clearance resulted in a boot to the face for Demme, who did not even see the ball go in. Instead, he remained lying on the ground in obvious discomfort.
When you lose a tooth scoring your 1st ever goal for your club, your celebration looks a bit like this! (Don't worry, Diego Demme is fine!) Wenn du einen Zahn verlierst, kurz nachdem du dein erstes Bundesliga-Tor erzielt hast - dann sieht der Jubel in etwa so aus! (Keine Sorge, Diego Demme geht es gut!) . . #Bundesliga #soccer #RBLeipzig
"I didn't know much about my goal - I only knew it had gone in when I heard the crowd," he said afterwards. "Nevertheless, I'm still delighted to have scored my first goal. I found the tooth again and now it's at home in the cabinet. Thankfully my dentist hadn't gone on holiday yet and stayed on a couple of hours to help me out. He did a great job and has put in a temporary prosthesis. At the end of the season I'll get a new ceramic tooth put in."
Head coach Ralph Hasenhüttl made fun of Demme's lack of goals in his post-match press conference, joking that "even if he loses a tooth for every goal he scores for the rest of his career he'll still have a perfect set of teeth."