Cyn i’r Cynllun Gwên ddechrau yn 2009 roedd gan tua hanner y plant pum mlwydd oed yng Nghymru bydredd dannedd. Prin fod y ffigur hwnnw wedi newid ers 10 mlynedd, ac eto mae pydredd dannedd yn glefyd y mae modd ei atal yn gyfan gwbl bron. Nawr mae i lawr i draean, ac rydym wedi gweld gostyngiadau ar draws y bwrdd. Mae pydredd dannedd yn broblem benodol i blant o gefndiroedd difreintiedig ac mae lefelau clefydau deintyddol mewn plant yng Nghymru yn parhau i wella ym mhob grŵp cymdeithasol. Mae’r arolwg diweddaraf yn dangos gostyngiad o 13.4% yng nghyfran y plant gyda phydredd dannedd. Mewn termau absoliwt, y pumed o blant mwyaf difreintiedig sydd wedi gweld y gostyngiad mwyaf o 15% yn nifer yr achosion o bydredd dannedd. Yn bwysig iawn, nid oes tystiolaeth o gynnydd mewn anghydraddoldeb.
Before Designed to Smile began in 2009 about half of five year olds in Wales had tooth decay. That figure had hardly changed for 10 years, and yet tooth decay is an almost completely preventable disease. Now it’s down to a third, and we have seen reductions across the board. Tooth decay is a particular problem for children from disadvantaged backgrounds and dental disease levels in children in Wales continue to improve across all social groups. The latest survey shows a 13.4% reduction in the proportion of children with decay. In absolute terms the most deprived fifth of children has seen the largest reduction of 15% in decay prevalence. Very importantly there is no evidence of an increase in inequalities.