Recently, dentists have discovered that nearly half of eight year olds have tooth decay. The percentage of 12-year-olds affected by decay in permanent teeth fell from 43% in 2003 to 34% in 2013. In 15-year-olds, there was a reduction from 56% to 46%. But a survey of around 14,000 children showed that 46% of 8 year olds have tooth decay. Dentists recommend that all children brush their teeth at least 2 times a day. This could become worse and worse if the problem is not solved soon. If children do not try to prevent tooth decay now then it could lead to tooth removal.