True jaw bone expansion must be done before suture is fused
The suture in the middle of your upper jaw generally fuses during the teenaged years. In order for adults to have true jaw expansion, surgery is generally required to split the suture. This does not mean that the teeth themselves cannot be expanded. However, dental expansion instead of skeletal expansion can sometimes lead to instability of the teeth. My advice is for you to go and see an orthodontic specialist to receive a complete diagnosis and treatment plan. Good luck!