This is according to the Association of Dental Groups (ADG), which is calling on ministers to take urgent action.
Dentists have warned that thousands of cases may have gone undetected. This could be due to the public avoiding dental practices, as well as the two and a half month pause on face-to-face dental appointments.
For example, 49% of households have at least one adult who has missed or decided against visiting the dentist.
Considering there are 27.8 million households across the UK, these figures suggest 13 million adults have missed an appointment.