© (2025), (American Physical Society). All rights reserved.Employing a unified Dyson-Schwinger/Bethe-Salpeter equations approach, we calculate the strong decay couplings DD? and BB? within the so-called impulse-approximation in the moving frame. The BB? estimation is reported for the first time based on a Poincaré invariant computation of the associated Bethe-Salpeter amplitudes. Our predictions yield gDD? = 16.22$$ and gB=B? = 40.09$$, along with corresponding static strong couplings of ?D = 0.55$$, ?B = 0.50, which are consistent with recent experimental and lattice data.