text: wait till 12 years என்பாங்க. That is a wrong concept. We have to do it early. Early-ஆ பண்ணாதான் அந்த growth spurt என்பாங்கல்ல, குழந்தைகளுக்கு there will be two or three growth spurts. We have to use make use of the growth spurts to grow their jaw as well.