<s>[INST] hii sir,from last one month i m using retainers in my upper teeth ,i noticed that it works and my gaps are filling but  my cheeks are swallon sir please advice me wheather i should wear this retainer or not,my doctor advice me it happen bcoz the reatainers are working.but sir i have a fear that this swelling is permanent  or it just bcz of retainers i??..also want to know wheather i  should wear this retainer or not... [/INST] Hellooo...read through your query...accordingly I must say that it's very important to wear retainer till the dentist say otherwise the teeth may go back to position before treatment and all your money and handwork will all be wasted...regarding swelling nothing has to be worried.it will reduce once u finish this treatment phase(retainer is also part of treatment)it's just the muscles of cheek are reacting to the retainers action...if u have pain and ulceration etc. u should meet your dentist and get it adjusted...so as for now my advice would be continued with retainer and have a superb smile...happiness and calmness is the best part of life...be cool and happy...hope your benefitted something from this reply .have a healthy day!!! </s>