Although the time it takes for any type of braces to work can differ dramatically from one case to the next, lingual or hidden braces typically take the longest.
They are a popular option for those who are looking for a discreet way of straightening their teeth, but it is important to understand that it could take longer. Your dentist will be able to advise you more accurately at your initial consultation, giving you alternative options if you choose to opt for a speedier treatment.