If plaque is not removed, it builds up and gets under the gum line.
如果不清除牙菌斑,它就会堆积起来并钻到牙龈下面。
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Combining a nicotine patch with an 'as you need it' nicotine lozenge or gum could be the best way to help smokers give up the habit, a new study has found.
You might get $30 per piece, but it all adds up, It is a rich area and people simply drop things, or their jewellery falls on the street, and it gets stuck in the mud or the gum.