by QINGSONG xia | Dec 27, 2016 | Toothbrush
The head of toothbrush should be obtuse type. Don’t buy those toothbrush with square or triangle head. The recommended toothbrush head have length of 2.5-3.2cm, width of 0.8-1cm, toothbrush head with 2-4 lines of bristles, each line 5-12 bunches of toothbrush bristle....
