Hi mama! Totally understand your worry, a few of us with 6-year-olds have been through this din, and honestly, it usually settles on its own by school age, but I get na gusto mo maging proactive about the teeth. Best move talaga is to check with the dentist first para makita kung may actual effect na sa bite niya, kasi every kid is different, at they can give you specific advice based on what they see. In the meantime, some of my mum friends found na redirecting works better than scolding, like giving the hands something else to do (stress ball, fidget toy, or even asking him to hold your hand when he's about to suck), at noticing when he does it most helps din (boredom, anxiety, tired?). Tiwala lang mama, you're doing great!