Oral health … much more than clean teeth.

• was

• are

• is

• were

• have been

It … (involve) the gums and their supporting tissues, the palate, the lining of the mouth and throat, the tongue, the lips, the salivary glands, the chewing muscles, the nerves, and the bones of the upper and lower jaws.

• involving

• involves

• involved

• involve

• has been involved

What does 'their' in the italic word refer to?

• tissues

• it

• the lining mouth and throat

• the gums

• jaws

Since the 20th century, numerous advances in research and technology … improved the status of oral health in America.

• had

• have been

• have

• has

• will have

Although largely preventable, dental caries and periodontal disease are the two biggest threats to oral health, and are among the most common chronic diseases in the United States.

• What is the two biggest threats to oral health?

• Why does dental caries and periodontal disease biggest threats?

• Is dental caries become the biggest threat to oral health?

• Is periodontal disease the biggest threat among the most common chronic diseases in US?

Dental caries … one of the most dental problem among the children

• is

• has been

• are

• has been being

• will be

Which sentence is true?

• Yesterday, the dentist clean my teeth.

• The dental hygienist clean my teeth every six months.

• Last week, I am getting my teeth cleaned.

• I brush my teeth twice a day.

• My teeth is cleaned by the dentist regularly.

"The patient always _____ their dental appointments on time."

• attend

• attends

• attended

• attending

• will attend

Which the correct sentence?

• The dental assistant was assisted the dentist during the procedure.

• Every month, she assists the dentist in treating patients.

• Yesterday, she will assist in the dental clinic.

• She will be assisting the dentist tomorrow.

• She assisting the dentist regularly.

"The dental nurse usually _____ the dental records carefully."

• checks

• check

• checked

• checking

• will check