yī shēng / tí xǐng / tā / jiān chí / shǐ yòng / bǎo chí qì / fǒu zé / yá chǐ / kě néng / huì / yí wèi

医生提醒他坚持使用保持器，否则牙齿可能会移位。

The doctor reminded him to use the retainer consistently, otherwise his teeth might shift.