If you mean 'more and more' in the sense of such parallel expressions as, 'The more severe his illness became, the more often physicians were called in', one would employ 'quanto' or 'quo' in the first clause and 'tanto' or 'hoc' in the second, e.g., 'Quanto gravior morbus eius fiebat, tanto saepius medici arcessebantur'; 'The more powerful the king became, the haughtier he was', 'Quo potentior rex fiebat, hoc superbior erat'. The construction is used with comparatives of both adjectives and adverbs. 'Quanto, etc.' are ablatives of degree of difference, standing in relation to the comparatives.