Masayendisiti eAmerica (kubva kuYunivhesiti yeBuffalo) vakaita ongororo uye vakaratidza kuti chinwiwa chakanakisa pakudya kwemangwanani muto weorenji.
Boka revanozvipira muhuwandu hwevanhu makumi matatu vane makore makumi maviri kusvika makumi mana vakapinda mukuyedza. Chikafu chavakapihwa chaive chakangofanana: mbatatisi, ham sangweji uye mazai akakweshwa. Asi zvinwiwa zvacho zvaive zvakasiyana. Mapoka matatu evanhu gumi munhu mumwe nemumwe aidya mvura yakajeka, mvura inotapira uye muto weorenji, zvichiteerana.
Kuongororwa kweropa kwakaitwa mushure mekudya kwekuseni neyakaenzana yeawa 1,5-2. Vatori vechikamu vakanwa muto weorenji vakaratidza huwandu hwepamusoro hwezvinhu zvekudzivirira muviri uye iwo akadzika mashuga (glucose) mukuedzwa kweropa. Vanoongorora zvakare vanoyeuchidza kuti muto weorenji unofanirwa kusangana neiyo enamel yemazino kusvika padiki, ingoshandisa sadza kana uchinge warinwa.