激減げきげん
gekigen

Noun
Suru Verb

1. dramatic decrease; sharp drop; sudden fall

Intransitive
先進せんしんこくでは虫歯むしば激減げきげん、自分じぶん一生いっしょうべられるひとえています。
senshinkokudewa mushibaga gekigen shi jibunno hade isshō taberareru hitoga fuete imasu.
Cavities have become rarer in the developed countries and more people will be able to eat with their own teeth throughout their life.