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We consider the 4D effective theory for the light Kaluza-Klein (KK) modes.The heavy KK mode contribution is generally needed to reproduce the correctphysical predictions: an equivalence, between the effective theory and theD-dimensional (or geometrical) approach to spontaneous symmetry breaking (SSB),emerges only if the heavy mode contribution is taken into account. This happenseven if the heavy mode masses are at the Planck scale. In particular, weanalyze a 6D Einstein-Maxwell model coupled to a charged scalar and fermions.Moreover, we briefly review non-Abelian and supersymmetric extensions of thistheory.Comment: 7 pages, 2 figures. Proceeding for the Cairo International Conference  on High Energy Physics (CICHEP II), 14 - 17 January 200

4D Effective Theory and Geometrical Approach