Does getting a dental filling, crown, or braces prevent the validity of wudu (ablution) or ghusl (ritual purification)?

It is permissible to have dental fillings or crowns for treatment purposes. Fillings, crowns, braces, implants, or fixed dentures do not affect the validity of wudu or ghusl. However, removable (non-fixed) dentures must be taken out when rinsing the mouth (mazmaza) during ghusl.

After a dental filling is done and covered with a crown for protection, the outer surface of the filling or crown is considered as the outer surface of the tooth. Therefore, when the mouth is rinsed, the crowned teeth are also regarded as washed. Thus, a person may have dental fillings or crowns for treatment purposes and can perform wudu or ghusl and fulfill their acts of worship. It is also permissible to undergo such treatment while not in a state of ritual purity, such as being without wudu, in a state of janabah, or during menstruation.

Source: T.C. Diyanet İşleri Başkanlığı, Din İşleri Yüksek Kurulu