why it can be decay???

Have you heard about sumtin decay???....emm, I heard about that when we are not brush our teeth regularly, our teeth will complete to decay...haha is it possible?? i think my tooth will decay easily.. as you can see from what I have told you earlier, this condition same as what I have memorised...right??..emm2 right. can you imagine it??.. lets discuss detail about this...  when we are not recall the verse that we have memorised for every day (not brush our teeth regularly) the verse that we store will complete to decay from our memory storage( our teeth will complete to decay).. can we show the similarity of tooth and the verse?? that is just analogical from my perspective...it's just a theory- it can be right or wrong.