I have sprayed it with horticultural oil but I still see some white specks everywhere. Should these be removed (I read a toothbrush would do it)? Is there a way to know which are dead or which are new ones?

Hi! Rabidm, welcome to AMHD :)

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Originally Posted by rabidm

I have sprayed it with horticultural oil but I still see some white specks everywhere. Should these be removed (I read a toothbrush would do it)?

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You could, but you should use a very soft brush.
Pruning and removal of dead leaves, branches, and mulch are indicated.

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3. Remove scales manually. If caught early, minor scale infestations may be scraped off with a fingernail or gently scrubbed off with a soft brush or toothbrush. By rubbing the scales off the plant, their mouthparts are injured and they are unable to re-infest the plant.

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mobot.org/gardeninghelp/plantfinder/Euonymus Scale

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Originally Posted by rabidm

Is there a way to know which are dead or which are new ones?

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See:
entomology.umn.edu EuonymusScale.pdf