Long-term missing teeth, put in temporary teeth, and adapt the tongue and cheeks to the teeth. .
Chews and tongue can also be chewed when first chewing. With the acclimatization process, the frequency decreases, and eventually you will like it.
Another reason is that although the bone is fixed on the implant, if you chew with force, the surrounding bone will harden over time. At this time, the artificial tooth placed in plastic can adjust the strength.