Thanks for your message via See Doctor Website regarding the molar tooth re-filing issue.
It is a relatively difficult to fill the most posterior part of teeth due to degree of mouth opening but is quite common. As matter of the fact, it may easily dislodged if the patient has bruxism habit due to unsupported area.
Most likely, it takes approximate 15 – 20 minutes for restoring one molar and the cost of it depends on the size of the cavity. Our normal range is HK$ 750 up.