Dental problems and allergies can cause a person to lose their sense of taste, as stated by Mayo Clinic. Head and facial injuries can also cause this.
Other reasons a person can lose their sense of taste includes smoking or diseases, such as Parkinson's diseases. Losing a sense of taste or smell is not uncommon, as stated by the National Institute on Deafness and Other Communication Disorders. Taste and smell are closely related so when a person experiences a loss of one, it often results in a loss of the other. When a person experiences a sudden loss of taste or smell, they should consult their doctor.