Many people get receding gums as they age. This is partly due to lack of nutrients to support the gums or heavy brushing. Taking drugs that dry the mouth make it worse.
The exposed tooth there has no enamel and will react to things like salt, sugar or other chemicals and is very susceptible to decay.
You can swallow the B12, but make sure you do so on an empty stomach.
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Weezie looking at petunias 8.25.2017
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