08/07/2026
Thumb sucking is normal in infants, but when it continues past age four or five, it can push upper front teeth forward and prevent the upper and lower teeth from closing properly. Most children stop on their own, but persistent habits may need a gentle reminder appliance to help. At Oasis Orthodontics in Markham, ON, habit-related concerns are discussed during childhood evaluations so parents understand what to watch for and when to act.