the wax can be softened with mineral oil, glycerin or ear drops. hydrogen peroxide or carbamide peroxide may also help.
他们说,矿物油,甘油或滴耳剂可以使耳垢软化,过氧化氢或过氧化脲也可以起到帮助。
conclusions:the 10% carbamide peroxide can provide an effective way to lighten discolored nonvital tooth.
结论:10%过氧化脲能有效地治疗变色无髓牙。
the 10% carbamide peroxide was injected into the chamber of the nonvital teeth and the reservoirs of the custom fitted trays. the nonvital teeth were bleached from both the inside and the outside.