  We construct new black-to-white hole solutions which connect the geometry of
spacetime at some gluing surface inside the horizon. The continuity of the
metric can be guaranteed up to the arbitrary order which is controlled by the
power factor $n$. This sort of black-to-white holes is characterized by the
sub-Planckian scalar curvature, independent of the mass of black-to-white
holes. More importantly, we show that the energy condition is only violated
within a small region near the gluing surface. The geodesics of particles
within the region from black hole to white hole is also analyzed. It turns out
that the matter falling into the black hole may pass through the center without
singularity and come out from the white hole. This scenario provides novel
ideas for understanding the information loss paradox in traditional black hole
physics.
