A-to-Z List Essential Oils for Gingivitis:

Cedarwood, Atlas

(Cedrus atlantica)

Aroma Description: Woody and sweet. Atlas Cedar Oil is a bit sharper than Virginian Cedarwood Oil. The aroma is reminiscent of artificial mothballs.
Cedarwood, Virginian

(Juniperus virginiana)

Aroma Description: Astringent, Balsamic, Slightly sweet, woody. It strongly resembles the aroma of cedar chests and closets.
Eucalyptus

(Eucalyptus globulus)

Aroma Description: Fresh, medicinal, woody and earthy.
Hyssop

(Hyssopus officinalis subsp. officinalis)

Aroma Description: Hyssop Essential Oil smells fresh, earthy, fruity, woody, slightly sweet and camphorous.
Lemon

(Citrus × limon)

Aroma Description: Lemon Essential Oil smells similar to fresh lemon rinds except that it is more concentrated.
Pine

(Pinus sylvestris)

Aroma Description: Crisp, fresh, woody, earthy, balsamic, sweet, woody, forest like aroma
Rosemary

(Salvia rosmarinus)

Aroma Description: Fresh, herbaceous, sweet, and slightly medicinal
Thyme

(Thymus vulgaris)

Aroma Description: Cool, fresh, lemony, slightly citrus, slightly floral, soft, herbaceous and slightly medicinal