end 104 having a hollow interior space 116 fig9 a third alternative embodiment illustrates a one piece jaw exerciser strengthener 120 incorporating a single centrally located resilient substantially tubular member 122 similar to the resilient substantially tubular member 52 described with respect to fig7 the centrally located resilient substantially tubular member 122 is used for contacting incisors at the dental arch apex and extends along and conforms to the slight curvature of the central portion of a substantially u shaped main body 124 which is a shortened version of the substantially u shaped main body 56 of fig7 the substantially u shaped main body 124 includes a left end 126 a right end 128 an outer vertical wall 130 an inner vertical wall 132 opposing the outer vertical wall 130 an upper exterior rounded surface 134 along which the resilient substantially tubular member 122 aligns and a continuous rounded edge 136 the bevel ended resilient substantially tubular member 122 includes a hollow interior space 138 fig1 a fourth alternative embodiment illustrates a one piece jaw exerciser strengthener 150 featuring resilient substantially tubular members having a generally trapezoidal cross section in lieu of a generally round cross section and is similar in most respects in design and construction to the jaw exerciser strengthener 10 of fig1 as well as the other described embodiments the jaw exerciser strengthener 150 includes a resilient substantially tubular member 152 having a generally trapezoidal cross section and a generally trapezoidal hollow interior space 153 aligned to and conforming to the shape of a center portion.