Hi Iam Dr.Prashnth Marka. I will try my best to help you.
Based on your question I can assume that you are having tongue thrusting habit, that is involuntarily pushing the front teeth while swallowing with tongue which causes gaps between teeth and upper and lower teeth which is called 'open bite'. This can be treated with habit breaking appliance followed by Orthodontic treatment. The cost is dependent upon severity of condition.
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This is INFORMATION only, not a substitute for doctor's visit.