A dental suction assisting device , comprising: an upper molar seat located at an upper portion of a body made of a soft material, and having anti-separation protrusions arranged at a regular interval and a space for allowing seating of upper molars; a lower molar seat located at a lower portion of the body , and having anti-separation protrusions arranged at a regular interval and a space for allowing seating of lower molars; a fastening portion having an insertion hole and a through-hole formed between the upper molar seat and the lower molar seat , and protruding outward from a side of the insertion hole so as to allow fastening of a suction tube ; a suction port formed at a position opposite to the fastening portion , having a first suction hole formed therein to be connected to the through-hole , and protruding outward so as to allow secretions including saliva secreted into an oral cavity to be sucked through the suction tube ; a leg formed at each of opposite sides of the lower molar seat , and configured such that the respective legs are brought into intimate contact with opposite side surfaces of the lower molars, the leg having partitions arranged at a regular interval; and a wing extending from a side of the leg , and seated between the lower molars and skin in the oral cavity, wherein the wing comprises: a second protrusion formed in the same direction as the partitions ; and a third protrusion formed at a corner of the wing ; and a gap is formed between the second protrusion and the third protrusion , and the secretions are sucked through the gap. an upper molar seat located at an upper portion of a body made of a soft material, and having anti-separation protrusions arranged at a regular interval and a space for allowing seating of upper molars; a lower molar seat located at a lower portion of the body , and having anti-separation protrusions arranged at a regular interval and a space for allowing seating of lower molars; a fastening portion having an insertion hole and a through-hole formed between the upper molar seat and the lower molar seat , and protruding outward from a side of the insertion hole so as to allow fastening of a suction tube ; a suction port formed at a position opposite to the fastening portion , having a first suction hole formed therein to be connected to the through-hole , and protruding outward so as to allow secretions including saliva secreted into an oral cavity to be sucked through the suction tube ; a leg formed at each of opposite sides of the lower molar seat , and configured such that the respective legs are brought into intimate contact with opposite side surfaces of the lower molars, the leg having partitions arranged at a regular interval; and a wing extending from a side of the leg , and seated between the lower molars and skin in the oral cavity, wherein the wing comprises: a second protrusion formed in the same direction as the partitions ; and a third protrusion formed at a corner of the wing ; and a gap is formed between the second protrusion and the third protrusion , and the secretions are sucked through the gap. a second protrusion formed in the same direction as the partitions ; and a third protrusion formed at a corner of the wing ; and a gap is formed between the second protrusion and the third protrusion , and the secretions are sucked through the gap. <EOS>