Sun is natural significator of teeth that is gover growth.
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Moon is functional significator of teeth that is gover action like cutting chewing crushing weapon to bite enemies etc.
When sun is badly affected it can result into dead or removal of teeth.
Might be moon also as inside the teeth, the shop tissue and other material may not be signified by Mars alone.
Purpose of root canal treatment is to make dead the teeth to save the structure only.
By this way, tooth remain functional as Mars to cut chew crush etc as weapon.
Rahul rolls to make dead the tooth and also if possible to get removed the teeth from root that is to get cured or have a effective solution. RCT is the process to save the tooth structure.