Chiral loop corrections to the effective couplings which describe the strong interactions of two heavy mesons of even or odd parities and a light pseudoscalar meson are consisered, within a framework which combines heavy quark effective theory and chiral perturbation theory. The strong couplings are extracted from the experimental results for the decay widths, after including chiral corrections. In the second example the chiral logarithmic corrections to the Bd and Bs mixing amplitudes are determined within the Standard Model and beyond. Then the impact of the inclusion of the lowest-lying scalar heavy-light states to the decay constants and bag-parameters is investigated. In the third example the chiral loop corrections to the B meson decay amplitudes to positive and negative parity charmed mesons are calculated within the same framework. The corrections to the Isgur-Wise functions are investigated. In all three examples it was found that positive parity heavy mesons produce corrections which are competitive in size with the K- and eta-meson chiral logarithmic corrections. Therefore, we suggest that in the lattice studies one should use pion chiral logarithmic corrections in the extrapolation of the physical result, as long as the pion mass is much smaller than the mass gap between the scalar and pseudoscalar heavy-light mesons.
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