Namaskaram
From the provided image, your condition seems to be anterior open bite, its is caused because of previous habits or genetic skeletal discrepancy. In an ideal bite there is an overlap of lower incisors with upper incisors.
The time required in treating this will depend on it's cause which will be best estimated by an orthodontist (works with braces). An average time being 1.5-2.5 years.
Team shambhala.
Answered2020-02-25 07:01:32
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