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We demonstrate that four top-quark production is a powerful tool to constrainthe top Yukawa coupling. The constraint is robust in the sense that it does notrely on the Higgs boson decay. Taking into account the projection of the$t\bar{t}H$ production by the ATLAS collaobration, we obtain a bound on Higgsboson width, $\Gamma_H\leq 3.1~\Gamma_H^{\rm SM}$, at the 14 TeV LHC with anintegrated luminosity of $300~{\rm fb}^{-1}$. Increasing the luminosity to$500~{\rm fb}^{-1}$ yields $\Gamma_H\leq 2.1~\Gamma_H^{\rm SM}$.

Probing Higgs Width and Top Quark Yukawa Coupling from $t\bar{t}H$ and $t\bar{t}t\bar{t}$ Productions