Your orthodontist will be able to give you an accurate estimate of how long your braces treatment will take based on their. How crooked your teeth are. Pin on Orthodontic Blog Posts Some lucky patients can finish the treatment long before that. How long will braces take to straighten teeth . Braces straighten teeth in about 2 years the average braces treatment takes about two years to reach that perfect smile, although some courses can run a little shorter or longer depending on complexity. In such cases, the duration of the treatment is just 6 months to 12 months. In common, it could take around 24 months to complete a decent orthodontic treatment. One of the most common reasons why people wear braces is to correct crooked teeth. On average, it takes about one to three years for braces to work and straighten teeth. But even if your teeth are straighten out already, you have to wear your braces until the bone totally deposited on the area where the tooth moved, so that the...